fix: unused partition version

drive.inc

@@ -79,7 +79,7 @@ function version_from_partnum
     local partnum="$2"
     version="$(parted -m "$drive" -- print|awk -F: \
         -v partnum="$partnum" \
-        '{if (NR > 2 && $1 == partnum && $1 >= 2 && $1 <= 4 &&
+        '{if (NR > 2 && $1 == partnum &&
                         $6 != "root unused") {
              print $6
          }}')"

tests/drive.sh

@@ -25,7 +25,8 @@ function test_partitioning()
 
     find_unused "$img"
     assertEquals "find_unused" 3 "$unused"
-    assertEquals "version_from_partnum unused" "" "$unused"
+    version_from_partnum "$img" 3
+    assertEquals "version_from_partnum unused" "" "$version"
 
     rename_partition "$img" 3 "root $min_version"
     find_oldest "$img"