selftests/powerpc: Fix out of bounds access in TM signal test

[Michael Ellerman]

On Wed, 2016-02-03 at 12:44:31 UTC, Michael Ellerman wrote:
> Gcc helpfully points out that we're accessing past the end of the gprs
> array:
> 
>   tm-signal-msr-resv.c: In function 'signal_usr1':
>   tm-signal-msr-resv.c:43:37: error: array subscript is above array bounds [-Werror=array-bounds]
>     ucp->uc_mcontext.regs->gpr[PT_MSR] |= (7ULL);
> 
> We haven't noticed previously because -flto was hiding it somehow.
> 
> The code is confused, PT_MSR isn't a gpr, instead it's in
> uc_regs->gregs, so fix it.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/501e279c231bd8d5eed4ecea5a

cheers