[PATCH linux-next] net/core: Remove unused assignment operations and variable

Although if_info_size is assigned, it has not been used. And the variable
should also be deleted.

The clang_analyzer complains as follows:

net/core/rtnetlink.c:3806: warning:

Although the value stored to 'if_info_size' is used in the enclosing expression,
the value is never actually read from 'if_info_size'.

Reported-by: Zeal Robot <redacted>
Signed-off-by: penghao luo <redacted>
---
 net/core/rtnetlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 327ca6b..52dc51a 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c

@@ -3804,9 +3804,9 @@ struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
 	struct net *net = dev_net(dev);
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
-	size_t if_info_size;
 
-	skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
+
+	skb = nlmsg_new((if_nlmsg_size(dev, 0)), flags);