hardcode arg0 in usage msg of packaging.sh

diff --git a/data/packaging.sh b/data/packaging.sh
index b16ada4..574c3dd 100755 (executable)
--- a/data/packaging.sh
+++ b/data/packaging.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 USAGE="usage:
-    $0 <git object> [-s] [-f spec_file]
+    tizenpkg packaging <git object> [-s] [-f spec_file]
 options:
     -s    silence remove patch without question
     -f    specify a spec file
@@ -322,4 +322,4 @@ rm tizen-patches -r
 info_msg "done."
 
 info_msg "You're on release branch now."
-info_msg "All the changes to release branch are done, please check, commit them."
\ No newline at end of file
+info_msg "All the changes to release branch are done, please check, commit them."