Reset callout if in nfs_timeout and rpcclnt_timeout functions. Timer

are supposed to continue firing as long as there is work to do, not
stop after the first invocation.

This is damage control after a patch that has been committed prematurely.

Tested by:	kris

sys/nfsclient/nfs_socket.c

@@ -1188,6 +1188,7 @@ nfs_timer(void *arg)
 		}
 	}
 	splx(s);
+	callout_reset(&nfs_callout, nfs_ticks, nfs_timer, NULL);
 }
 
 /*

sys/rpc/rpcclnt.c

@@ -1478,6 +1478,8 @@ rpcclnt_timer(arg)
 
 #ifdef __OpenBSD__
 	timeout_add(rpcclnt_timer, to, rpcclnt_ticks);
+#else
+	callout_reset(&rpcclnt_callout, rpcclnt_ticks, rpcclnt_timer, NULL);
 #endif
 }