Merge branch 'ly/am-split-stgit-leakfix'

Leakfix.

* ly/am-split-stgit-leakfix:
  builtin/am: fix memory leak in `split_mail_stgit_series`

builtin/am.c

@@ -850,8 +850,10 @@ static int split_mail_stgit_series(struct am_state *state, const char **paths,
 	series_dir = dirname(series_dir_buf);
 
 	fp = fopen(*paths, "r");
-	if (!fp)
+	if (!fp) {
+		free(series_dir_buf);
 		return error_errno(_("could not open '%s' for reading"), *paths);
+	}
 
 	while (!strbuf_getline_lf(&sb, fp)) {
 		if (*sb.buf == '#')