ltsi/scripts: Add usage information to generate_git

The README states there is a --help argument to the script but non
existed, so here it is. The START environment variable isn't working
properly (or I don't know how to properly use it) so it has not been
included. Autoresume is probably what you want anyways.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/scripts/generate_git b/scripts/generate_git
index 9cdaf37..1eb4462 100755
--- a/scripts/generate_git
+++ b/scripts/generate_git
@@ -9,6 +9,14 @@
 #
 #
 
+if [ "$1" = "--help" ]; then
+	echo -e "Usage: `basename $0` [--help | -a]"
+	echo -e "  If no options are specified the script assumes no LTSI branch has been created"
+	echo -e "  [--help]\tShows usage information"
+	echo -e "  [-a]\t\tAuto resume after last applied patch (skipping branch creation)"
+	exit 0
+fi
+
 UPSTREAM="git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git"
 if [ "$1" = "-a" ]; then
 	AUTORESUME=1