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[binutils-gdb/gdb-7.12-branch] Avoid potential memory leak in find_frame_funname

*** TEST RESULTS FOR COMMIT d2ed2edaf76fc10505214290d04c3cf312acfbca ***

Author: Tom Tromey <tom@tromey.com>
Branch: gdb-7.12-branch
Commit: d2ed2edaf76fc10505214290d04c3cf312acfbca

Avoid potential memory leak in find_frame_funname

The PR 18565 thread pointed out that, if cp_remove_params can throw
(we aren't quite sure), then find_frame_funname could leak some
memory.  This patch avoids any potential issue by rearranging some
code in find_frame_funname.

Built and regtested on x86-64 Fedora 24.

2016-08-03  Tom Tromey  <tom@tromey.com>

	* stack.c (find_frame_funname): Avoid any possible leak in case
	cp_remove_params can throw.
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