Remove context param from sv_get_backrefs

v5.21.7-83-geaab564 added sv_get_backrefs.  v5.21.7-90-g8fbcb65
removed the one use of aTHX.

1 files changed, 1 insertions, 1 deletions

diff --git a/sv.c b/sv.c
index 3f0344b917..a0e1801313 100644
--- a/sv.c
+++ b/sv.c
@@ -5955,7 +5955,7 @@ Perl_sv_kill_backrefs()
 */
 
 SV *
-Perl_sv_get_backrefs(pTHX_ SV *const sv)
+Perl_sv_get_backrefs(SV *const sv)
 {
     SV *backrefs= NULL;