Fix check on NULL input for drawer function

The test was not done on the first argument..

diff --git a/pgfincore.c b/pgfincore.c
index 8ac5c6359fbcef554a362239ee6b3d5dc4750729..b73d66bb2c2070270c777a49157602230e4f3bca 100644 (file)
--- a/pgfincore.c
+++ b/pgfincore.c
@@ -1111,7 +1111,7 @@ pgfincore_drawer(PG_FUNCTION_ARGS)
        bits8 *sp;
        bits8 x;
 
-       if (PG_ARGISNULL(1))
+       if (PG_ARGISNULL(0))
                elog(ERROR, "pgfincore_drawer: databit argument shouldn't be NULL");
 
         databit        = PG_GETARG_VARBIT_P(0);