convert-functions: remove unused function

Changelog: None

Signed-off-by: Mirza Krak <mirza.krak@northern.tech>

mender-convert-functions.sh

@@ -463,17 +463,6 @@ mender_image_size_to_total_storage_size() {
   return 0
 }
 
-# Takes following arguments:
-#
-#  $1 - raw disk image
-unmount_partitions() {
-  log "Check if device is mounted..."
-  is_mounted=`grep ${1} /proc/self/mounts | wc -l`
-  if [ ${is_mounted} -ne 0 ]; then
-    sudo umount ${1}?*
-  fi
-}
-
 # Takes following arguments:
 #
 #  $1 - raw disk image path