http-push: free remote_ls_ctx.dentry_name

The remote_ls_ctx struct has dentry_name string, which is filled in with
a heap allocation in the handle_remote_ls_ctx() XML callback. After the
XML parse is done in remote_ls(), we should free the string to avoid a
leak.

This fixes several leaks found by running t5540.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-push.c

@@ -1183,6 +1183,7 @@ static void remote_ls(const char *path, int flags,
 	}
 
 	free(ls.path);
+	free(ls.dentry_name);
 	free(url);
 	strbuf_release(&out_buffer.buf);
 	strbuf_release(&in_buffer);