lavf/utils: fix if_( style

libavformat/utils.c

@@ -3827,7 +3827,7 @@ int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
                 if (percentd_found)
                     goto fail;
                 percentd_found = 1;
-                if(number < 0)
+                if (number < 0)
                     nd += 1;
                 snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
                 len = strlen(buf1);