Convert a pp_sys test to use warnings 'closed', instead of the broader 'io'.

It's actually only testing warnings enabled by 'closed', so test using the
tighter category.

1 files changed, 2 insertions, 2 deletions

diff --git a/t/lib/warnings/pp_sys b/t/lib/warnings/pp_sys
index 62e47c160f..b2783062b8 100644
--- a/t/lib/warnings/pp_sys
+++ b/t/lib/warnings/pp_sys
@@ -291,7 +291,7 @@ flock() on unopened filehandle FOO at - line 19.
 flock() on unopened filehandle at - line 20.
 ########
 # pp_sys.c [pp_prtf pp_send pp_bind pp_connect pp_listen pp_accept pp_shutdown pp_ssockopt ppp_getpeername]
-use warnings 'io' ;
+use warnings 'closed';
 use Config; 
 BEGIN { 
   if ( $^O ne 'VMS' and ! $Config{d_socket}) {
@@ -333,7 +333,7 @@ getsockopt STDIN, 1,2;
 getsockname STDIN;
 getpeername STDIN;
 closedir STDIN;
-no warnings 'io' ;
+no warnings 'closed';
 send STDIN, "fred", 1;
 bind STDIN, "fred" ;
 connect STDIN, "fred" ;