Fix segfault in src/bin/jp2/opj_decompress.c due to uninitialized pointer (fixes #1368) (#1369)

Author: xiaoxiaoafeifei

src/bin/jp2/opj_decompress.c

@@ -1356,7 +1356,7 @@ int main(int argc, char **argv)
         int it_image;
         num_images = get_num_images(img_fol.imgdirpath);
 
-        dirptr = (dircnt_t*)malloc(sizeof(dircnt_t));
+        dirptr = (dircnt_t*)calloc(1, sizeof(dircnt_t));
         if (!dirptr) {
             destroy_parameters(&parameters);
             return EXIT_FAILURE;