return error code upon errors

codec/j2k_to_image.c

@@ -553,18 +553,18 @@ int main(int argc, char **argv) {
 			dirptr->filename = (char**) malloc(num_images*sizeof(char*));
 
 			if(!dirptr->filename_buf){
-				return 0;
+				return 1;
 			}
 			for(i=0;i<num_images;i++){
 				dirptr->filename[i] = dirptr->filename_buf + i*OPJ_PATH_LEN;
 			}
 		}
 		if(load_images(dirptr,img_fol.imgdirpath)==1){
-			return 0;
+			return 1;
 		}
 		if (num_images==0){
 			fprintf(stdout,"Folder is empty\n");
-			return 0;
+			return 1;
 		}
 	}else{
 		num_images=1;