BUG_ON() conversion in fs/nfsd/

This patch converts an if () BUG(); construct to BUG_ON();
which occupies less space, uses unlikely and is safer when
BUG() is disabled.
Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

fs/nfsd/nfs4xdr.c

@@ -198,8 +198,7 @@ static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
 		p = new;
 		memcpy(p, argp->tmp, nbytes);
 	} else {
-		if (p != argp->tmpp)
-			BUG();
+		BUG_ON(p != argp->tmpp);
 		argp->tmpp = NULL;
 	}
 	if (defer_free(argp, kfree, p)) {