[PATCH/RFA] Fix busted logic in find_saved_register()

[Jason R Thorpe <thorpej at wasabisystems dot com>]

find_saved_register() is used by mips_get_saved_register() and
the alpha_get_saved_register() in my (updated) multi-arch changes
for the Alpha target.

While investigating some testsuite failures, it appeared that
there is no way thjat find_saved_register() could possibly work
on either MIPS or Alpha, since the first thing it does on either
of those platforms is dereference a NULL pointer (said pointer is
initlaized to NULL at the top of the function).

I believe the following patch makes find_saved_register() actually
implement the logic it claims to.  It certainly fixes the problem
I had with GDB dumping core, and fixes the relevant testsuite failures.

OK to commit?

	* frame.c (find_saved_register): Avoid a NULL pointer
	dereference and actually walk the frame list.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>

Attachment: frame-patch
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