[PATCH 3/8] Initialize 'ra' to zero to avoid uninitialized use.

[John Baldwin]

If the instruction in this case does not include an RA field, then 'ra'
is used uninitialized.  Use the same idiom used elsewhere in this file of
initializing ra to zero before check for an RA field.

gdb/ChangeLog:

	* rs6000-tdep.c (ppc_process_record_op31): Initialize ra.
---
 gdb/ChangeLog     | 4 ++++
 gdb/rs6000-tdep.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 335476b..38fcb30 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2016-06-11  John Baldwin  <jhb@FreeBSD.org>
+
+	* rs6000-tdep.c (ppc_process_record_op31): Initialize ra.
+
 2016-06-10  Tom Tromey  <tom@tromey.com>
 
 	* gdbtypes.c (arch_type, arch_integer_type, arch_character_type)
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 645fe92..1ed1354 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -4631,6 +4631,7 @@ ppc_process_record_op31 (struct gdbarch *gdbarch, struct regcache *regcache,
 	  || at_dcsz == 0)
 	at_dcsz = 128; /* Assume 128-byte cache line size (POWER8)  */
 
+      ra = 0;
       if (PPC_RA (insn) != 0)
 	regcache_raw_read_unsigned (regcache,
 				    tdep->ppc_gp0_regnum + PPC_RA (insn), &ra);
-- 
2.7.0