patch 8.1.0178: warning for passing pointer to non-pointer argument

Problem:    Warning for passing pointer to non-pointer argument.
Solution:   Use zero instead of NULL.
diff --git a/src/if_ole.cpp b/src/if_ole.cpp
index aaa3868..0888883 100644
--- a/src/if_ole.cpp
+++ b/src/if_ole.cpp
@@ -759,7 +759,7 @@
     hr = RegisterActiveObject(
 	app,
 	MYCLSID,
-	NULL,
+	0,
 	&app_id);
 
     if (FAILED(hr))
diff --git a/src/version.c b/src/version.c
index 88d3b7e..1f94b01 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    178,
+/**/
     177,
 /**/
     176,