Some minor refactoring.

diff --git a/coders/png.c b/coders/png.c
index 8fadcf525a56965c564ef63dff83a1044bafe0fd..762ed4d45493354a6caf80c2b994fa7d18708652 100644 (file)
--- a/coders/png.c
+++ b/coders/png.c
@@ -6009,10 +6009,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
                     AcquireNextImage(image_info,image,exception);
 
                     if (GetNextImageInList(image) == (Image *) NULL)
-                      {
-                        image=DestroyImageList(image);
-                        return((Image *) NULL);
-                      }
+                      return(DestroyImageList(image));
 
                     image=SyncNextImageInList(image);
                   }
@@ -6592,10 +6589,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
                     AcquireNextImage(image_info,image,exception);
 
                     if (GetNextImageInList(image) == (Image *) NULL)
-                      {
-                        image=DestroyImageList(image);
-                        return((Image *) NULL);
-                      }
+                      return(DestroyImageList(image));
 
                     image=SyncNextImageInList(image);
                   }
@@ -6644,10 +6638,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
               AcquireNextImage(image_info,image,exception);
 
               if (GetNextImageInList(image) == (Image *) NULL)
-                {
-                  image=DestroyImageList(image);
-                  return((Image *) NULL);
-                }
+                return(DestroyImageList(image));
 
               image=SyncNextImageInList(image);
             }
@@ -6692,10 +6683,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
             AcquireNextImage(image_info,image,exception);
 
             if (GetNextImageInList(image) == (Image *) NULL)
-              {
-                image=DestroyImageList(image);
-                return((Image *) NULL);
-              }
+              return(DestroyImageList(image));
 
             image=SyncNextImageInList(image);
           }
@@ -6769,8 +6757,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
     if (image->columns == 0 || image->rows == 0)
       {
         (void) CloseBlob(image);
-        image=DestroyImageList(image);
-        return((Image *) NULL);
+        return(DestroyImageList(image));
       }
 
     mng_info->image=image;
@@ -6881,10 +6868,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
                 AcquireNextImage(image_info,image,exception);
 
                 if (GetNextImageInList(image) == (Image *) NULL)
-                  {
-                    image=DestroyImageList(image);
-                    return((Image *) NULL);
-                  }
+                  return(DestroyImageList(image));
 
                 large_image=SyncNextImageInList(image);
 
@@ -7461,13 +7445,11 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
           AcquireNextImage(image_info,image,exception);
           if (GetNextImageInList(image) == (Image *) NULL)
             {
-              image=DestroyImageList(image);
-
               if (logging != MagickFalse)
                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
                   "  Allocation failed, returning NULL.");
 
-              return((Image *) NULL);
+              return(DestroyImageList(image));;
             }
           image=SyncNextImageInList(image);
         }
@@ -7503,7 +7485,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
           CoderError,"Linked list is corrupted, beginning of list not found",
           "`%s'",image_info->filename);
 
-        return((Image *) NULL);
+        return(DestroyImageList(image));
       }
 
     image=GetPreviousImageInList(image);
@@ -7541,10 +7523,7 @@ static Image *ReadOneMNGImage(MngInfo* mng_info, const ImageInfo *image_info,
       (void) ThrowMagickException(exception,GetMagickModule(),
         CoderError,"No visible images in file","`%s'",image_info->filename);
 
-      if (image != (Image *) NULL)
-        image=DestroyImageList(image);
-
-      return((Image *) NULL);
+      return(DestroyImageList(image));
     }
 
   if (mng_info->ticks_per_second)