[file-roller] cfile: avoid compiler warning

[Paolo Bacchilega <paobac src gnome org>]

commit f5d006acbeb75141053cab92c1d2a2d4d59b9625
Author: Aleksander Morgado <aleksander lanedo com>
Date:   Thu Sep 26 16:00:54 2013 +0200

    cfile: avoid compiler warning
    
    If mime type is unhandled, warning and return. Otherwise 'compressed_filename'
    will be used even if uninitialized:
    
      fr-command-cfile.c: In function ‘fr_command_cfile_add’:
      fr-command-cfile.c:311:9: warning: ‘compressed_filename’ may be used uninitialized in this function 
[-Wmaybe-uninitialized]
        g_free (compressed_filename);
               ^
    
    https://bugzilla.gnome.org/show_bug.cgi?id=708839

 src/fr-command-cfile.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/fr-command-cfile.c b/src/fr-command-cfile.c
index 9965ee4..6b15768 100644
--- a/src/fr-command-cfile.c
+++ b/src/fr-command-cfile.c
@@ -287,6 +287,12 @@ fr_command_cfile_add (FrCommand  *comm,
                fr_process_add_arg (comm->process, filename);
                fr_process_end_command (comm->process);
                compressed_filename = g_strconcat (filename, ".rz", NULL);
+       } else {
+               g_warning ("Unhandled mime type: '%s'", archive->mime_type);
+               g_warn_if_reached ();
+               g_free (temp_file);
+               g_free (temp_dir);
+               return;
        }
 
        /* copy compressed file to the dest dir */