NFC: trf7970a: Unlock mutex before exiting trf7970a_irq()
Recent changes to trf7970a_irq() added a couple return paths that don't unlock the mutex that is locked when the routine is entered. Fix this by ensuring the mutex is always unlocked before returning. Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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