[PATCH] Initialize variable and silence GCC warning from last commit

[Sergio Durigan Junior <sergiodj@redhat.com>]

BuildBot e-mailed me to let me know that my last commit broke GDB on
RHEL-7.1 s390x.  On solib-svr4.c:svr4_handle_solib_event, 'val' now
needs to be initialized as NULL because it is inside a TRY..CATCH
block.  This patch does that.  Pushed as obvious.

gdb/ChangeLog:
2015-09-01  Sergio Durigan Junior  <sergiodj@redhat.com>

	* solib-svr4.c (svr4_handle_solib_event): Initialize 'val' as NULL
---
 gdb/ChangeLog    | 4 ++++
 gdb/solib-svr4.c | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8ed469f..80fff7e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,9 @@
 2015-09-01  Sergio Durigan Junior  <sergiodj@redhat.com>
 
+	* solib-svr4.c (svr4_handle_solib_event): Initialize 'val' as NULL
+
+2015-09-01  Sergio Durigan Junior  <sergiodj@redhat.com>
+
 	* solib-svr4.c (solib_event_probe_action): Call
 	get_probe_argument_count using TRY...CATCH.
 	(svr4_handle_solib_event): Likewise, for evaluate_probe_argument.
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
index 5d2b9dd..d3411fa 100644
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -1908,7 +1908,7 @@ svr4_handle_solib_event (void)
   struct probe_and_action *pa;
   enum probe_action action;
   struct cleanup *old_chain, *usm_chain;
-  struct value *val;
+  struct value *val = NULL;
   CORE_ADDR pc, debug_base, lm = 0;
   int is_initial_ns;
   struct frame_info *frame = get_current_frame ();
-- 
2.4.3