KPath.Adopt() fixed incorrect path/buffer length.

* The other object was left in an inconsistent state.
* This lets the unit test for Adopt() pass.

src/system/kernel/fs/KPath.cpp

@@ -98,6 +98,8 @@ KPath::Adopt(KPath& other)
 	fBufferSize = other.fBufferSize;
 
 	other.fBuffer = NULL;
+	other.fBufferSize = 0;
+	other.fPathLength = 0;
 }