fix build warning of type mismatch

Signed-off-by: Benstone Zhang <benstonezhang@gmail.com>

Author: benstonezhang

ext/exif/exif.c

@@ -4389,7 +4389,7 @@ static bool exif_scan_HEIF_header(image_info_type *ImageInfo, unsigned char *buf
 			if (remain) {
 				memcpy(data, buf + box_header_size, remain);
 			}
-			if (exif_read_from_stream_file_looped(ImageInfo->infile, data + remain, limit - remain) == limit - remain) {
+			if (exif_read_from_stream_file_looped(ImageInfo->infile, (char*)(data + remain), limit - remain) == limit - remain) {
 				exif_isobmff_parse_meta(data, data + limit, &pos);
 			}
 			efree(data);
@@ -4398,8 +4398,8 @@ static bool exif_scan_HEIF_header(image_info_type *ImageInfo, unsigned char *buf
 				(php_stream_seek(ImageInfo->infile, pos.offset + 2, SEEK_SET) >= 0)) {
 				limit = pos.size - 2;
 				data = (unsigned char *)safe_emalloc(1, limit, 0);
-				if (exif_read_from_stream_file_looped(ImageInfo->infile, data, limit) == limit) {
-					exif_process_APP1(ImageInfo, data, limit, pos.offset + 2);
+				if (exif_read_from_stream_file_looped(ImageInfo->infile, (char*)data, limit) == limit) {
+					exif_process_APP1(ImageInfo, (char*)data, limit, pos.offset + 2);
 					ret = true;
 				}
 				efree(data);