doio.c: Use SvREFCNT_dec_NN

The sole use of SvREFCNT_dec in doio.c is on a variable than is
never null (setdefout would fail an assertion otherwise), so
no need to check whether it is.

1 files changed, 1 insertions, 1 deletions

diff --git a/doio.c b/doio.c
index 08ed433d6a..1cc0e412ff 100644
--- a/doio.c
+++ b/doio.c
@@ -908,7 +908,7 @@ Perl_nextargv(pTHX_ GV *gv)
 	{
 	    GV * const oldout = MUTABLE_GV(av_pop(PL_argvout_stack));
 	    setdefout(oldout);
-	    SvREFCNT_dec(oldout);
+	    SvREFCNT_dec_NN(oldout);
 	    return NULL;
 	}
 	setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO));