fix #64738, fix implicit type declaration

diff --git a/ext/gd/libgd/gd_interpolation.c b/ext/gd/libgd/gd_interpolation.c
index ccdefb9b46746318f3843e353888b29d9155d9d3..6c5549eba6bf2c17ee70183a89f451397d3175d3 100644 (file)
--- a/ext/gd/libgd/gd_interpolation.c
+++ b/ext/gd/libgd/gd_interpolation.c
@@ -978,7 +978,7 @@ static inline void _gdScaleRow(gdImagePtr pSrc,  unsigned int src_width, gdImage
 
                /* Accumulate each channel */
         for (i = left; i <= right; i++) {
-                       const left_channel = i - left;
+                       const int left_channel = i - left;
             r += (unsigned char)(contrib->ContribRow[x].Weights[left_channel] * (double)(gdTrueColorGetRed(p_src_row[i])));
             g += (unsigned char)(contrib->ContribRow[x].Weights[left_channel] * (double)(gdTrueColorGetGreen(p_src_row[i])));
             b += (unsigned char)(contrib->ContribRow[x].Weights[left_channel] * (double)(gdTrueColorGetBlue(p_src_row[i])));