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/4119>

Commit(s) tested:
	b67aeab02c05fdd654f132a550dd4f196cb1f6d3

Author(s) (in the same order as the commits):
	Simon Marchi <simon.marchi@polymtl.ca>

Subject:
	Remove lwp -> pid conversion in linux_nat_xfer_partial

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Debian-s390x-native-gdbserver-m64/b6/b67aeab02c05fdd654f132a550dd4f196cb1f6d3/>