[SCSI] mptfusion: unlock on error in mpt_config()

We introduced a new return here and forgot to unlock the mutex.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: "Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index a5c591f..444143e 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -6483,6 +6483,7 @@
 				printk(MYIOC_s_INFO_FMT "%s: host reset in"
 					" progress mpt_config timed out.!!\n",
 					__func__, ioc->name);
+				mutex_unlock(&ioc->mptbase_cmds.mutex);
 				return -EFAULT;
 			}
 			spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);