net: ipv4: remove redundant initialization in inet_rtm_deladdr

The initialization for 'err' with '-EINVAL' is redundant and
can be removed, as it is updated soon.

Changes since v1:
- Remove redundant empty line
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Link: https://lore.kernel.org/r/20201108010541.12432-1-dong.menglong@zte.com.cnSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv4/devinet.c

@@ -650,8 +650,7 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct in_device *in_dev;
 	struct ifaddrmsg *ifm;
 	struct in_ifaddr *ifa;
-
-	int err = -EINVAL;
+	int err;
 
 	ASSERT_RTNL();