[binutils-gdb] [gdb/testsuite] Fix return type of psymtab-parameter

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT ed6c0bfb2643861636581ac8775144efa1728c7c ***

Author: Thomas Preud'homme <thomas.preudhomme@arm.com>
Branch: master
Commit: ed6c0bfb2643861636581ac8775144efa1728c7c

[gdb/testsuite] Fix return type of psymtab-parameter

As pointed out by Pedro Alves, psymtab-parameter testcase rely on the
return type being long. This patch revert the changes made in
f106e10e5e80265e1c43532bba4cb997a7dfa022 and change psymtab-parameter.cc
to return 0 long instead.

2017-11-29  Thomas Preud'homme  <thomas.preudhomme@arm.com>

gdb/testsuite/
	* gdb.cp/psymtab-parameter.cc (func): Change return type back to long.
	Return 0 as a long.
	* gdb.cp/psymtab-parameter.exp: Change func's return type back to long.