NFSD: Clean up switch statement in nfsd_dispatch()

Reorder the arms so the compiler places checks for the most frequent
case first.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfssvc.c

@@ -1030,12 +1030,12 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
 
 	/* Check whether we have this call in the cache. */
 	switch (nfsd_cache_lookup(rqstp)) {
-	case RC_DROPIT:
-		return 0;
+	case RC_DOIT:
+		break;
 	case RC_REPLY:
 		return 1;
-	case RC_DOIT:;
-		/* do it */
+	case RC_DROPIT:
+		return 0;
 	}
 
 	/* need to grab the location to store the status, as