parisc: Fix uninitialized variable usage in unwind.c
As noticed by Dave Anglin, the last commit introduced a small bug where the potentially uninitialized r struct is used instead of the regs pointer as input for unwind_frame_init(). Fix it. Signed-off-by: NHelge Deller <deller@gmx.de> Reported-by: NJohn David Anglin <dave.anglin@bell.net>
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