[gnome-software/gnome-3-24] trivial: Prevent critical warning when trying to parse an invalid URI

[Richard Hughes <rhughes src gnome org>]

commit de98a7a721f42186e259957a2e24bcba4d88c031
Author: Richard Hughes <richard hughsie com>
Date:   Fri May 5 20:52:13 2017 +0100

    trivial: Prevent critical warning when trying to parse an invalid URI

 lib/gs-plugin.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/lib/gs-plugin.c b/lib/gs-plugin.c
index c1c892a..e334dbe 100644
--- a/lib/gs-plugin.c
+++ b/lib/gs-plugin.c
@@ -1262,6 +1262,13 @@ gs_plugin_download_file (GsPlugin *plugin,
        /* remote */
        g_debug ("downloading %s to %s from plugin %s", uri, filename, priv->name);
        msg = soup_message_new (SOUP_METHOD_GET, uri);
+       if (msg == NULL) {
+               g_set_error (error,
+                            GS_PLUGIN_ERROR,
+                            GS_PLUGIN_ERROR_DOWNLOAD_FAILED,
+                            "failed to parse URI %s", uri);
+               return FALSE;
+       }
        if (app != NULL) {
                helper.plugin = plugin;
                helper.app = app;