Fix the check in the signal handler code to check if there is an inner

signal handler before calling it.  Previously we check if there was a
get_value function.

RELNOTES

@@ -186,6 +186,9 @@ work on other platforms. Please report any problems and suggested fixes to
 - Fixed a fenceposting bug when a client had two host records configured,
   one using 'uid' and the other using 'hardware ethernet'.
 
+- Fixed the check in the dhcp_interface_signal_handler routine to verify
+  the existence of the linked signal handler before calling it.
+
 			Changes since 4.1.0b1
 
 - A missing "else" in dhcrelay.c could have caused an interface not to

common/discover.c

@@ -1559,7 +1559,7 @@ isc_result_t dhcp_interface_signal_handler (omapi_object_t *h,
 	}
 
 	/* Try to find some inner object that can take the value. */
-	if (h -> inner && h -> inner -> type -> get_value) {
+	if (h -> inner && h -> inner -> type -> signal_handler) {
 		status = ((*(h -> inner -> type -> signal_handler))
 			  (h -> inner, name, ap));
 		if (status == ISC_R_SUCCESS)