arm-autonomy/xenguest-manager: Fixed subshell false positive

Removed private check from check_size and is_integer to prevent
false positive error on execution in a subshell

Issue-Id: SCM-1623
Signed-off-by: Nathan Dunne <Nathan.Dunne@arm.com>
Change-Id: I57564bf610e21244c963a77c0669da5d4526eeff
Signed-off-by: Ross Burton <ross.burton@arm.com>

meta-arm-autonomy/recipes-extended/xenguest/files/xenguest-manager

@@ -70,8 +70,6 @@ function check_private()
 
 is_integer() {
 
-    check_private
-
     if ! [[ "${1}" =~ ^[0-9]+$ ]]; then
         >&2 echo "error: invalid number '${1}'"; exit 1
     fi
@@ -80,8 +78,6 @@ is_integer() {
 # check size and convert it to MB, e.g '1[G]' => '1000M'
 check_size() {
 
-    check_private
-
     local disksize="${1}"
 
     [ -n "${disksize}" ] || disksize="invalid"