xprtrdma: Eliminate "connstate" variable from rpcrdma_conn_upcall()

mainline inclusion
from mainline-4.20
commit aadc5a94
category: bugfix
bugzilla: NA
CVE: NA

-------------------------------------------------

Clean up.

Since commit 173b8f49 ("xprtrdma: Demote "connect" log messages")
there has been no need to initialize connstat to zero. In fact, in
this code path there's now no reason not to set rep_connected
directly.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

Conflicts:
  net/sunrpc/xprtrdma/verbs.c
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>