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We assume that "pmic" could be NULL and then dereference it two lines
later.  I fix this by moving the dereference inside the NULL check.

Fixes: c013f0a5

 ('mfd: Add pm8xxx irq support')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>