patch 9.0.0373: Coverity warns for NULL check and unused return value

Problem:    Coverity warns for NULL check and unused return value.
Solution:   Remove the NULL check, it was already checked earlier.  Add (void)
            to ignore the return value.

src/version.c

@@ -707,6 +707,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    373,
 /**/
     372,
 /**/