dist/threads/t/join.t: adjust ps option

The ps's option '-f' is not supported by busybox in oe.

Upstream-Status: Inappropriate
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
 dist/threads/t/join.t | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dist/threads/t/join.t b/dist/threads/t/join.t
--- a/dist/threads/t/join.t
+++ b/dist/threads/t/join.t
@@ -118,7 +118,7 @@ if ($^O eq 'linux') {
                  })->join;
     #print "# mainthread: \$0 = $0\n";
     #print "# pid = $$\n";
-    if (open PS, "ps -f |") { # Note: must work in (all) systems.
+    if (open PS, "ps |") { # Note: must work in (all) systems.
         my ($sawpid, $sawexe);
         while (<PS>) {
             chomp;
@@ -135,10 +135,10 @@ if ($^O eq 'linux') {
         if ($sawpid) {
             ok($sawpid && $sawexe, 'altering $0 is effective');
         } else {
-            skip("\$0 check: did not see pid $$ in 'ps -f |'");
+            skip("\$0 check: did not see pid $$ in 'ps |'");
         }
     } else {
-        skip("\$0 check: opening 'ps -f |' failed: $!");
+        skip("\$0 check: opening 'ps |' failed: $!");
     }
 } else {
     skip("\$0 check: only on Linux");
-- 
1.8.1.2