Failures on Debian-s390x-native-gdbserver-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	debian-jessie-s390x-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Debian-s390x-native-gdbserver-m64/builds/3980>

Commit(s) tested:
	f03265d9cda1f5f8df238efa9b7a20330e5711f1

Author(s) (in the same order as the commits):
	Sam Thursfield <sam.thursfield@codethink.co.uk>

Subject:
	Fix compile time warnings about using possibly uninitialised variables in rs6000-core.c.

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Debian-s390x-native-gdbserver-m64/f0/f03265d9cda1f5f8df238efa9b7a20330e5711f1/>