isl_pw_templ.c: copy: fix return

diff --git a/isl_pw_templ.c b/isl_pw_templ.c
index d585e2f..29b7c3a 100644 (file)
--- a/isl_pw_templ.c
+++ b/isl_pw_templ.c
@@ -98,7 +98,7 @@ error:
 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 {
        if (!pw)
-               return;
+               return NULL;
 
        pw->ref++;
        return pw;