drivers/net/ehea/ehea_main.c: Release mutex in error handling code

The mutex is released on a successful return, so it would seem that it
should be released on an error return as well.

The semantic patch finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression l;
@@

mutex_lock(l);
... when != mutex_unlock(l)
    when any
    when strict
(
if (...) { ... when != mutex_unlock(l)
+   mutex_unlock(l);
    return ...;
}
|
mutex_unlock(l);
)
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/net/ehea/ehea_main.c

@@ -2937,9 +2937,9 @@ static void ehea_rereg_mrs(struct work_struct *work)
 				}
 			}
 		}
-       mutex_unlock(&dlpar_mem_lock);
 	ehea_info("re-initializing driver complete");
 out:
+	mutex_unlock(&dlpar_mem_lock);
 	return;
 }