scripts: extra exit() calls in usage() function

Remove the exit() calls from usage as they should be handled by the caller.

Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/gensync.sh.in

@@ -44,7 +44,6 @@ note: The <destfile> name is important. It must be of the form\n\
       generated database must reside in the same directory as your\n\
       custom packages (also configured in /etc/pacman.conf)\n\n")"
 	echo "$(gettext "Example:  gensync /var/abs/local /home/mypkgs/custom.db.tar.gz")"
-	exit 0
 }
 
 version() {

scripts/updatesync.sh.in

@@ -43,7 +43,6 @@ directory and then compresses it to <destfile>.\n\n")"
 updatesync will calculate md5sums of packages in the same directory as\n\
 <destfile>, unless an alternate [package_directory] is specified.\n\n")"
 	echo "$(gettext "Example:  updatesync upd /home/mypkgs/custom.db.tar.gz PKGBUILD")"
-	exit 0
 }
 
 version() {