scripts: equality test '==' is not portable.

On NetBSD 3 we trigger an error:

    [: ==: unexpected operator

Double-equal is accepted by bash built-in '[' and bash(1) suggests
using '=' for strict POSIX compliance (test(1) from coreutils does not
mention '==').  Eradicate their uses everywhere.

[jc: Somebody with a pseudonym kindly sent a message to let
 me know about the problem privately; I do not have access to a NetBSD
 box.]

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/git-status-script b/git-status-script
index 2b029545de..ee8f7061ea 100755
--- a/git-status-script
+++ b/git-status-script
@@ -77,9 +77,9 @@ then
 #'
 fi
 
-if [ "$committable" == "0" ]
-then
+case "$committable" in
+0)
 	echo "nothing to commit"
 	exit 1
-fi
+esac
 exit 0