powerpc: Check rc of notifier chain for memory remove

The return code from invocation of the notifier for
pSeries_reconfig_chain during update of the device tree is not
checked.  This causes writes to /proc/ppc64/ofdt to update memory
properties (i.e. ibm,dyamic-reconfiguration-memory) to always
return success, instead of the result of the notifier chain.

This happens specifically when we remove/add memory from the
device tree on machines using memory specified in the
ibm,dynamic-reconfiguration-memory property of the device tree.
Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/pseries/reconfig.c

@@ -466,11 +466,11 @@ static int do_update_property(char *buf, size_t bufsize)
 		else
 			action = PSERIES_DRCONF_MEM_REMOVE;
 
-		blocking_notifier_call_chain(&pSeries_reconfig_chain,
-					     action, value);
+		rc = blocking_notifier_call_chain(&pSeries_reconfig_chain,
+						  action, value);
 	}
 
-	return 0;
+	return rc;
 }
 
 /**