avr32: Don't mask signals in the error path

avr32: Don't mask signals in the error path

The current handle_signal() implementation is broken - it will mask
signals if we fail to setup the signal stack frame, which isn't the
desired behaviour, we should only be masking signals if we succeed in
setting up the stack frame. It looks like this code was copied from
the old (broken) arm implementation but wasn't updated when the arm
code was fixed in commit a6c61e9dfdd0 ("[ARM] 3168/1: Update ARM
signal delivery and masking").

Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Havard Skinnemoen <hskinnemoen@gmail.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>