[rhythmbox] Fix typo in comment

[Piotr Drąg <piotrdrag src gnome org>]

commit 38c7d47bca168d22982e9e16fa210ff97daa6c79
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Sep 10 20:16:43 2015 +0200

    Fix typo in comment

 .../rb-audioscrobbler-radio-source.c               |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/audioscrobbler/rb-audioscrobbler-radio-source.c 
b/plugins/audioscrobbler/rb-audioscrobbler-radio-source.c
index af7543f..81ef40f 100644
--- a/plugins/audioscrobbler/rb-audioscrobbler-radio-source.c
+++ b/plugins/audioscrobbler/rb-audioscrobbler-radio-source.c
@@ -137,7 +137,7 @@ static const char* radio_names[] = {
        N_("%s's Mix Radio"),
        /* Translators: station is built from the tracks which have been "tagged" with %s.
         * Last.fm lets users "tag" songs with any string they wish. Tags are usually genres,
-        * but nationalities, record labels, decades and very random words are also commmon */
+        * but nationalities, record labels, decades and very random words are also common */
        N_("%s Tag Radio"),
        /* Translators: station is built from the library of the group %s */
        N_("%s Group Radio"),