cifs: remove unused variable 'server'

Fix build warning by removing unused variable 'server':

fs/cifs/inode.c:1089:26: warning:
variable server set but not used [-Wunused-but-set-variable]
1089 | struct TCP_Server_Info *server;
| ^~~~~~

Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Steve French <[e-mail]>
Reviewed-by: Aurelien Aptel <[e-mail]>

fs/cifs/inode.c

···
 		    struct super_block *sb, unsigned int xid)
 {
 	struct cifs_tcon *tcon;
-	struct TCP_Server_Info *server;
 	struct tcon_link *tlink;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	bool adjust_tz = false;
···
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);
 	tcon = tlink_tcon(tlink);
-	server = tcon->ses->server;
 
 	/*
 	 * 1. Fetch file metadata