[binutils-gdb] Change rs6000_ptrace_ldinfo to return a byte_vector

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 09473be85c13eab0d794e363d898b74d66431d72 ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 09473be85c13eab0d794e363d898b74d66431d72

Change rs6000_ptrace_ldinfo to return a byte_vector

This changes rs6000_ptrace_ldinfo to return a byte_vector.  I think
this points out an existing double-free in
rs6000_xfer_shared_libraries.

Tested by the buildbot.

gdb/ChangeLog
2018-04-01  Tom Tromey  <tom@tromey.com>

	* rs6000-nat.c (rs6000_ptrace_ldinfo): Return a byte_vector.
	(rs6000_xfer_shared_libraries): Update.