perf: skip redundant mkdir_p in funpack for entries without subdirectories

tools/funpack.c

@@ -126,19 +126,20 @@ static int extract_entry(const char *out_dir, const fpk_entry_t *entry,
 			   const void *data, size_t size)
 {
 	char *full_path = join_path(out_dir, entry->path);
-	char *dir_part = dup_str(full_path);
-	char *slash = strrchr(dir_part, '/');
 	FILE *fp;
 
-	if (slash) {
+	if (strchr(entry->path, '/') != NULL) {
+		char *dir_part = dup_str(full_path);
+		char *slash = strrchr(dir_part, '/');
+
 		*slash = '\0';
 		if (!mkdir_p(dir_part)) {
 			free(dir_part);
 			free(full_path);
 			return 0;
 		}
+		free(dir_part);
 	}
-	free(dir_part);
 
 	fp = fopen(full_path, "wb");
 	if (!fp) {