Staging: Correct use of ! and &

Correct priority problem in the use of ! and &.

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

// <smpl>
@@ expression E; constant C; @@
- !E & C
+ !(E & C)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rt3090/sta_ioctl.c

@@ -1840,10 +1840,8 @@ int rt_ioctl_siwencode(struct net_device *dev,
             }
         else
 			/* Don't complain if only change the mode */
-		if(!erq->flags & IW_ENCODE_MODE)
-		{
-				return -EINVAL;
-		}
+		if (!(erq->flags & IW_ENCODE_MODE))
+			return -EINVAL;
 	}
 
 done:

drivers/staging/vt6656/iwctl.c

@@ -1409,8 +1409,7 @@ int iwctl_siwencode(struct net_device *dev,
 		// Do we want to just set the transmit key index ?
 		if ( index < 4 ) {
 		    pDevice->byKeyIndex = index;
-		}
-		else if(!wrq->flags & IW_ENCODE_MODE) {
+		} else if (!(wrq->flags & IW_ENCODE_MODE)) {
 				rc = -EINVAL;
 				return rc;
 	    }