Failures on Fedora-ppc64le-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	fedora-ppc64le-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Fedora-ppc64le-m64/builds/4793>

Commit(s) tested:
	1bb44c9f567c75355c1b4417d88cda959e82a3a3

Author(s) (in the same order as the commits):
	Tom Tromey <tom@tromey.com>

Subject:
	Use gdbpy_ref in call_doc_function

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Fedora-ppc64le-m64/1b/1bb44c9f567c75355c1b4417d88cda959e82a3a3/>