SUNRPC: Fix default hostname created in rpc_create()

Since 43780b87..., rpc_create() fills in a default hostname based on
the ip address if the servername passed in is null.  A small typo made
that default incorrect.  (But this information appears to be used only
for debugging right now, so I don't believe the typo causes any bugs in
the current kernel.)

Thanks to Olga Kornievskaia for bug report and testing.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Cc: Olga Kornievskaia <aglo@citi.umich.edu>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/clnt.c

@@ -259,7 +259,7 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
 	 */
 	if (args->servername == NULL) {
 		struct sockaddr_in *addr =
-					(struct sockaddr_in *) &args->address;
+					(struct sockaddr_in *) args->address;
 		snprintf(servername, sizeof(servername), NIPQUAD_FMT,
 			NIPQUAD(addr->sin_addr.s_addr));
 		args->servername = servername;