[gnome-software] trivial: Fix specifying '--plugin-names=dummy' when using gnome-software-cmd

[Richard Hughes <rhughes src gnome org>]

commit cf1e244a4206d52586ea89e74c2cad27a319ad1c
Author: Richard Hughes <richard hughsie com>
Date:   Tue Apr 19 14:57:30 2016 +0100

    trivial: Fix specifying '--plugin-names=dummy' when using gnome-software-cmd

 src/gs-cmd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-cmd.c b/src/gs-cmd.c
index f566fb3..cb60dcb 100644
--- a/src/gs-cmd.c
+++ b/src/gs-cmd.c
@@ -226,7 +226,7 @@ main (int argc, char **argv)
                  "Use this maximum cache age in seconds", NULL },
                { "prefer-local", '\0', 0, G_OPTION_ARG_NONE, &prefer_local,
                  "Prefer local file sources to AppStream", NULL },
-               { "plugin-names", '\0', 0, G_OPTION_ARG_NONE, &plugin_names_str,
+               { "plugin-names", '\0', 0, G_OPTION_ARG_STRING, &plugin_names_str,
                  "Whitelist only these plugin names", NULL },
                { "verbose", '\0', 0, G_OPTION_ARG_NONE, &verbose,
                  "Show verbose debugging information", NULL },