Squeeze 2 bytes out of the startup code

git-svn-id: svn://svn.cc65.org/cc65/trunk@414 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/apple2/crt0.s

@@ -46,10 +46,10 @@ zpspace	= * - zpstart		; Zero page space allocated
 ; ------------------------------------------------------------------------
 ; Actual code
 
-	ldy	#zpspace-1
-L1:	lda	sp,y
-   	sta	zpsave,y	; Save the zero page locations we need
-	dey
+       	ldx	#zpspace-1
+L1:	lda	sp,x
+   	sta	zpsave,x	; Save the zero page locations we need
+	dex
        	bpl	L1
 
 ; Clear the BSS data
@@ -89,8 +89,7 @@ L1:	lda	sp,y
 
 ; fall thru to exit...
 
-_exit:
-	lda	#$ff
+_exit:	lda	#$ff
 	sta	TEXTTYP
 
 	jsr	doatexit 	; call exit functions
@@ -100,10 +99,10 @@ _exit:
 
 ; Copy back the zero page stuff
 
-	ldy	#zpspace-1
-L2:	lda	zpsave,y
-	sta	sp,y
-	dey
+	ldx	#zpspace-1
+L2:	lda	zpsave,x
+	sta	sp,x
+	dex
        	bpl	L2
 
 ; Reset changed vectors, back to basic