Failures on Fedora-s390x-m64, branch master

[sergiodj+buildbot@redhat.com]

Buildslave:
	marist-fedora-s390x

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Fedora-s390x-m64/builds/1789>

Commit(s) tested:
	7cc53fba0a4e5c316a6e86fdae28f8cc9d0f9a68

Author(s) (in the same order as the commits):
	Luis Machado <lgustavo@codesourcery.com>

Subject:
	Do not pass NULL for the string in catch_errors

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/cgit/Fedora-s390x-m64/.git/tree/?h=master&id=e0b5319b01d9373619e82e4fe5e532145e926135>

*** Regressions found ***
============================
PASS -> FAIL: gdb.base/siginfo-thread.exp: Extract si_errno
new FAIL: gdb.threads/thread-specific-bp.exp: non-stop: continue to end (timeout)
============================


*** Regressions against the baseline ***
============================
PASS -> FAIL: gdb.base/siginfo-thread.exp: Extract si_errno
new FAIL: gdb.opt/solib-intra-step.exp: second-hit
PASS -> FAIL: gdb.server/non-existing-program.exp: gdbserver exits cleanly
new FAIL: gdb.threads/thread-specific-bp.exp: non-stop: continue to end (timeout)
PASS -> FAIL: gdb.threads/watchthreads.exp: threaded watch loop
PASS -> FAIL: gdb.threads/watchthreads.exp: combination of threaded watchpoints = 30
PASS -> FAIL: gdb.trace/mi-traceframe-changed.exp: tfile: tfind 0 again
PASS -> FAIL: gdb.trace/mi-traceframe-changed.exp: tfile: -trace-find frame-number 0
============================


*** Failures that are being ignored ***
============================
FAIL: gdb.base/async-shell.exp: process stopped (timeout)
============================