[PATCH 2/2 v2] use lib function ismounted in convertfs module

[Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

convertfs module use a private function of ismounted(), this is
duplicate of the one in dracut-lib.sh.

Change to use global ismounted

Signed-off-by: Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/30convertfs/convertfs.sh |    9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

--- dracut.orig/modules.d/30convertfs/convertfs.sh
+++ dracut/modules.d/30convertfs/convertfs.sh
@@ -9,6 +9,8 @@ if [[ ! -d "$ROOT" ]]; then
     exit 1
 fi
 
+type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+
 if [[ "$ROOT" -ef / ]]; then
     echo "Can't convert the running system."
     echo "Please boot with 'rd.convertfs' on the kernel command line,"
@@ -73,13 +75,6 @@ if [[ ! -e "$testfile" ]]; then
 fi
 rm -f "$testfile"
 
-ismounted() {
-    while read a m a; do
-        [[ "$m" = "$1" ]] && return 0
-    done < /proc/mounts
-    return 1
-}
-
 # clean up after ourselves no matter how we die.
 cleanup() {
     echo "Something failed. Move back to the original state"