Fix minor problems found by static checking.

* buffer.c (Fdelete_all_overlays): Return nil.
* doc.c (Fsubstitute_command_keys):
* regex.c (WEAK_ALIAS):
* xdisp.c (redisplay_internal):
Move initialization down, to pacify GCC 4.7.1 -Wjump-misses-init.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/doc.c b/src/doc.c
index 02a5b4b8143..c21935577f2 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -848,9 +848,10 @@ Otherwise, return a new string, without any text properties.  */)
           struct buffer *oldbuf;
           ptrdiff_t start_idx;
           /* This is for computing the SHADOWS arg for describe_map_tree.  */
-          Lisp_Object active_maps = Fcurrent_active_maps (Qnil, Qnil);
+          Lisp_Object active_maps;
           Lisp_Object earlier_maps;
 
+          active_maps = Fcurrent_active_maps (Qnil, Qnil);
           changed = 1;
           strp += 2;            /* skip \{ or \< */
           start = strp;