svcauth_gss: replace a trivial 'switch' with an 'if'

Code like:

  switch(xxx) {
  case -error1:
  case -error2:
     ..
     return;
  case 0:
     stuff;
  }

  can more naturally be written:

  if (xxx < 0)
      return;

  stuff;
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/auth_gss/svcauth_gss.c

@@ -1034,30 +1034,27 @@ static int svcauth_gss_handle_init(struct svc_rqst *rqstp,
 	rsi_free(&rsikey);
 	if (!rsip)
 		return SVC_CLOSE;
-	switch (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) {
-	case -EAGAIN:
-	case -ETIMEDOUT:
-	case -ENOENT:
+	if (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
 		/* No upcall result: */
 		return SVC_CLOSE;
-	case 0:
-		ret = SVC_CLOSE;
-		/* Got an answer to the upcall; use it: */
-		if (gss_write_init_verf(rqstp, rsip))
-			goto out;
-		if (resv->iov_len + 4 > PAGE_SIZE)
-			goto out;
-		svc_putnl(resv, RPC_SUCCESS);
-		if (svc_safe_putnetobj(resv, &rsip->out_handle))
-			goto out;
-		if (resv->iov_len + 3 * 4 > PAGE_SIZE)
-			goto out;
-		svc_putnl(resv, rsip->major_status);
-		svc_putnl(resv, rsip->minor_status);
-		svc_putnl(resv, GSS_SEQ_WIN);
-		if (svc_safe_putnetobj(resv, &rsip->out_token))
-			goto out;
-	}
+
+	ret = SVC_CLOSE;
+	/* Got an answer to the upcall; use it: */
+	if (gss_write_init_verf(rqstp, rsip))
+		goto out;
+	if (resv->iov_len + 4 > PAGE_SIZE)
+		goto out;
+	svc_putnl(resv, RPC_SUCCESS);
+	if (svc_safe_putnetobj(resv, &rsip->out_handle))
+		goto out;
+	if (resv->iov_len + 3 * 4 > PAGE_SIZE)
+		goto out;
+	svc_putnl(resv, rsip->major_status);
+	svc_putnl(resv, rsip->minor_status);
+	svc_putnl(resv, GSS_SEQ_WIN);
+	if (svc_safe_putnetobj(resv, &rsip->out_token))
+		goto out;
+
 	ret = SVC_COMPLETE;
 out:
 	cache_put(&rsip->h, &rsi_cache);