sunrcp: make function _svc_create_xprt static

The function _svc_create_xprt is local to the source and
does not need to be in global scope, so make it static.

Cleans up sparse warning:
symbol '_svc_create_xprt' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/svc_xprt.c

@@ -250,7 +250,7 @@ void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new)
 	svc_xprt_received(new);
 }
 
-int _svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
+static int _svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
 			    struct net *net, const int family,
 			    const unsigned short port, int flags)
 {