ui-blob: fix resource leak: free before return

Coverity-id: 13943
Signed-off-by: Christian Hesse <mail@eworm.de>
diff --git a/ui-blob.c b/ui-blob.c
index d3c3a10..70a671e 100644
--- a/ui-blob.c
+++ b/ui-blob.c
@@ -99,6 +99,7 @@
 		return -1;
 	buf[size] = '\0';
 	html_raw(buf, size);
+	free(buf);
 	return 0;
 }