fix some typo

localize isinstalled function

functions.sh

@@ -9,7 +9,7 @@ function e {
 # arg1: file
 # arg2: age to compare
 function _fileOlderThan {
-	test -f "$1" || { return 0 }
+	if [ ! -f $1 ] ; then echo -ne "0;" ; return 0 ; fi
 	test $(find test -mtime +$2)
 	return $?
 }
@@ -151,18 +151,18 @@ function addHeader {
 }
 
 # get file md5
-
+# arg1: file to checksum
 function md5 {
 	test -f "$1" && local am=$(md5sum "$1"  | awk '{print $1}')	
 	echo -ne "${am};"
 }
+
 # init pkg list
 function _initPkgList {
 	root="$1"
 	test -f "${1}/tmp/pkg.list" || chroot "$1" sh -c "rpm -qa > /tmp/pkg.list"
 }
 
-
 # Ok if given package is installed
 # arg1: rootfs
 # arg2: pkg to check