silence compiler warnings using INCMARK/POPMARK

v5.23.3-305-g6cae08a introduced debugging variants of INCMARK/POPMARK, and
replaced a number of "PL_markstack_ptr--;" with "POPMARK;" etc.

This spews a bunch of "value computed is not used" warnings; so
add some "(void)"s.

Also indent the new definitions of INCMARK/POPMARK correctly.

1 files changed, 2 insertions, 2 deletions

diff --git a/perl.c b/perl.c
index 8182562cdf..b8d98ff04b 100644
--- a/perl.c
+++ b/perl.c
@@ -2776,9 +2776,9 @@ Perl_call_sv(pTHX_ SV *sv, VOL I32 flags)
     }
     else {
 	myop.op_other = (OP*)&myop;
-	POPMARK;
+	(void)POPMARK;
 	create_eval_scope(flags|G_FAKINGEVAL);
-	INCMARK;
+	(void)INCMARK;
 
 	JMPENV_PUSH(ret);