[nautilus] NautilusFile: fix crash in modify_link_hash_table

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c2a5e05231ea0743ef89e666c37a0a77534b9573
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Nov 6 21:53:45 2013 -0600

    NautilusFile: fix crash in modify_link_hash_table
    
    We crash in g_hash_table_lookup_extended if the file's symlink_name is
    set but the file is not a symlink, since the hash function (g_str_hash)
    does not allow NULL values but target_uri is NULL.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=711583

 libnautilus-private/nautilus-file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libnautilus-private/nautilus-file.c b/libnautilus-private/nautilus-file.c
index 6fbc6d8..4287fc8 100644
--- a/libnautilus-private/nautilus-file.c
+++ b/libnautilus-private/nautilus-file.c
@@ -553,7 +553,7 @@ modify_link_hash_table (NautilusFile *file,
        GList **list_ptr;
 
        /* Check if there is a symlink name. If none, we are OK. */
-       if (file->details->symlink_name == NULL) {
+       if (file->details->symlink_name == NULL || !nautilus_file_is_symbolic_link (file)) {
                return;
        }