megaraid_sas: Fix reset_mutex leak

The following patch for megaraid_sas fixes a reset_mutex leak in megasas_reset_fusion().

Signed-off-by: Adam Radford <[e-mail]>
Reviewed-by: Martin K. Petersen <[e-mail]>
Signed-off-by: Christoph Hellwig <[e-mail]>

drivers/scsi/megaraid/megaraid_sas_fusion.c

···
 		printk(KERN_WARNING "megaraid_sas: Hardware critical error, "
 		       "returning FAILED for scsi%d.\n",
 			instance->host->host_no);
+		mutex_unlock(&instance->reset_mutex);
 		return FAILED;
 	}