[minor] Fix classpath from class calculation utility for classes dir

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/ClassPathTest.kt

@@ -15,6 +15,7 @@ import java.util.jar.JarEntry
 import java.util.jar.JarOutputStream
 import java.util.jar.Manifest
 import kotlin.script.experimental.jvm.util.classPathFromTypicalResourceUrls
+import kotlin.script.experimental.jvm.util.classpathFromClass
 import kotlin.script.experimental.jvm.util.classpathFromClassloader
 import kotlin.script.experimental.jvm.util.scriptCompilationClasspathFromContextOrNull
 
@@ -80,6 +81,13 @@ class ClassPathTest : TestCase() {
             tempDir.deleteRecursively()
         }
     }
+
+    @Test
+    fun testClasspathFromClass() {
+        val cpFromThis = classpathFromClass(this::class)
+        val expectedSuffix = "classes/kotlin/test"
+        assertTrue("Path should end with $expectedSuffix, got: $cpFromThis", cpFromThis!!.first().path.endsWith(expectedSuffix))
+    }
 }
 
 private val emulatedCollectionFiles = arrayOf(

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/util/jvmClasspathUtil.kt

@@ -118,7 +118,7 @@ internal fun ClassLoader.rawClassPathFromKeyResourcePath(keyResourcePath: String
                 keyResourcePathDepth = keyResourcePath.trim('/').count { it == '/' }
             }
             var root = file
-            for (i in 1..keyResourcePathDepth) {
+            for (i in 0..keyResourcePathDepth) {
                 root = root.parentFile
             }
             root