patch 8.1.0738: using freed memory, for loop over blob leaks memory

Problem:    Using freed memory, for loop over blob leaks memory.
Solution:   Clear pointer after freeing memory.  Decrement reference count
            after for loop over blob.

src/version.c

@@ -795,6 +795,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    738,
 /**/
     737,
 /**/