Fix typo in tIME calculation of ptime.minutes

diff --git a/coders/png.c b/coders/png.c
index 150e0f0aaf0c2900aaa25d53ed5d98ffc41b6275..82c3219cf88c405027860828fd4703b963d81f5e 100644 (file)
--- a/coders/png.c
+++ b/coders/png.c
@@ -8207,7 +8207,7 @@ static void write_tIME_chunk(Image *image,png_struct *ping,png_info *info,
             }
          }
       }
-      ptime.minute=+60;
+      ptime.minute-=60;
    }
    ptime.second=(png_byte) second;
    png_set_tIME(ping,info,&ptime);