vim-patch:8.0.0004 (#7044)

Problem:    A string argument for function() that is not a function name
            results in an error message with NULL. (Christian Brabandt)
Solution:   Use the argument for the error message.

5582ef1438

src/nvim/version.c

@@ -725,7 +725,7 @@ static const int included_patches[] = {
   // 7 NA
   6,
   // 5 NA
-  // 4,
+  4,
   // 3,
   2,
   1,