[ARM] PXA ssp: unlock when ssp tries to close an invalid port

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/ssp.c

@@ -309,6 +309,7 @@ void ssp_exit(struct ssp_dev *dev)
 
     	if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
 		printk(KERN_WARNING "SSP: tried to close invalid port\n");
+		mutex_unlock(&mutex);
 		return;
 	}