sunrpc: kstrtoul() can also return -ERANGE

Smatch complains that "num" can be uninitialized when kstrtoul() returns
-ERANGE.  It's true enough, but basically harmless in this case.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/auth.c

@@ -50,7 +50,7 @@ static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp)
 	if (!val)
 		goto out_inval;
 	ret = kstrtoul(val, 0, &num);
-	if (ret == -EINVAL)
+	if (ret)
 		goto out_inval;
 	nbits = fls(num - 1);
 	if (nbits > MAX_HASHTABLE_BITS || nbits < 2)