Back-patch 9.4-era compiler warning fixes into older branches.

Back-patch commit 4e182361804f8688cef953c998e24134e606aea4
(another thing that longfin's version of clang doesn't like).

diff --git a/src/pl/plperl/plperl.c b/src/pl/plperl/plperl.c
index 436d477bf4a6c5389348b05f8a851edbaebf81b5..5c229cae0d44b714b5fd487034f64b05c2ea444c 100644 (file)
--- a/src/pl/plperl/plperl.c
+++ b/src/pl/plperl/plperl.c
@@ -1787,7 +1787,7 @@ plperl_inline_handler(PG_FUNCTION_ARGS)
    /* Set up a callback for error reporting */
    pl_error_context.callback = plperl_inline_callback;
    pl_error_context.previous = error_context_stack;
-   pl_error_context.arg = (Datum) 0;
+   pl_error_context.arg = NULL;
    error_context_stack = &pl_error_context;
 
    /*