SUNRPC: Fix a bug in call_decode()
call_verify() can, under certain circumstances, free the RPC slot. In that case, our cached pointer 'req = task->tk_rqstp' is invalid. Bug was introduced in commit 220bcc2a (SUNRPC: Don't call xprt_release in call refresh). Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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