some fixes and refactoring for IEC SAVE

c64/kernal/iec/load_iec.s

@@ -101,7 +101,7 @@ iec_load_loop:
 
 	// Advance pointer to data; it is OK if it advances past $FFFF,
 	// one autostart technique does exactly this
-	jsr lvs_advance_pointer
+	jsr lvs_advance_EAL
 	
 	// Handle STOP key; it is probably an overkill to do it
 	// with every byte, once per 32 bytes should be enough

c64/kernal/iec/save_iec.s

@@ -86,17 +86,12 @@ iec_save_loop:
 	sta TBTCNT
 	clc
 	jsr iec_tx_byte
-	jsr lvs_advance_pointer
+	jsr lvs_advance_STAL
 	jmp iec_save_loop
 
 iec_save_loop_end:
 
-	// Send last byte 
-	sta TBTCNT
-	clc                   // XXX really?
-	jsr iec_tx_byte
-
-	// Close file on drive      // XXX does not work properly
+	// Close file on drive
 	lda FA
 	jsr UNLSN
 
@@ -112,7 +107,6 @@ iec_save_loop_end:
 	lda FA
 	jsr UNLSN
 
-
 	// Return success
 	clc
 	rts