x86/pkeys/selftests: Remove dead debugging code, fix dprint_in_signal

There is some noisy debug code at the end of the signal handler.  It was
disabled by an early, unconditional "return".  However, that return also
hid a dprint_in_signal=0, which kept dprint_in_signal=1 and effectively
locked us into permanent dprint_in_signal=1 behavior.

Remove the return and the dead code, fixing dprint_in_signal.

Signed-off-by: Dave Hansen <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael Ellermen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ram Pai <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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