Suppress error messages about GPT from sfdisk - they will happen ordinarily...

Suppress error messages about GPT from sfdisk - they will happen ordinarily and we don't need to see them

init

@@ -31,8 +31,8 @@ freespaceafter() {
     local escaped
     local start
     escaped="$(echo ""$2"" | sed 's|/|\\/|g')"
-    start="$(sfdisk -d $1 | sed -n "/$escaped/p" | sed -r 's/.*start=\s*([0-9]+),.*/\1/g')"
-    sfdisk -q -F $1 | sed -n '/^\s*[0-9]/p' | sed -r 's/^\s*([0-9]+)\s.*/\1/g' | while read freespace
+    start="$(sfdisk -d $1 2> /dev/null | sed -n "/$escaped/p" | sed -r 's/.*start=\s*([0-9]+),.*/\1/g')"
+    sfdisk -q -F $1 2> /dev/null | sed -n '/^\s*[0-9]/p' | sed -r 's/^\s*([0-9]+)\s.*/\1/g' | while read freespace
     do
 	if [ $freespace -gt $start ]; then
 	    echo "available"
@@ -44,7 +44,7 @@ freespaceafter() {
 maximize() {
     local escaped
     escaped="$(echo ""$2"" | sed 's|/|\\/|g')"
-    sfdisk -d $1 | sed "/$escaped/ s/,\ssize=.*//g" | sfdisk $1 > /dev/null 2> /dev/null
+    sfdisk -d $1 2> /dev/null | sed "/$escaped/ s/,\ssize=.*//g" | sfdisk $1 > /dev/null 2> /dev/null
     fsck.ext4 -f -y $2 > /dev/null 2> /dev/null
     resize2fs $2 > /dev/null 2> /dev/null
 }