cdda: CID 610847: possibly uninitialized fields

In two cases:
* Out of memory and strdup on fName failed. Nothing would be
initialized (mostly harmless: InitCheck would detect this)
* There are no frames in the track: the wav header would be left
uninitialized, and this would be readable from userland (bad thing, but
needs a specifically crafted malicious CD to happen).

src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp

@@ -1165,9 +1165,7 @@ Inode::Inode(Volume* volume, Inode* parent, const char* name, uint64 start,
 	:
 	fNext(NULL)
 {
-	fName = strdup(name);
+	memset(&fWAVHeader, 0, sizeof(wav_header));
-	if (fName == NULL)
-		return;
 
 	fID = volume->GetNextNodeID();
 	fType = type;
@@ -1179,6 +1177,10 @@ Inode::Inode(Volume* volume, Inode* parent, const char* name, uint64 start,
 
 	fCreationTime = fModificationTime = time(NULL);
 
+	fName = strdup(name);
+	if (fName == NULL)
+		return;
+
 	if (frames) {
 		// initialize WAV header