fix non-OS memcpy

Author: adriweb

src/libc/memcpy.src

@@ -12,15 +12,15 @@ else
 _memcpy:
 	ld	iy,0
 	add	iy,sp
-	ld	bc,(iy + 6)
+	ld	bc,(iy + 9)  ; Load count
 	sbc	hl,hl
 	sbc	hl,bc
 	jr	z,.zero
-	ld	de,(iy + 0)
-	ld	hl,(iy + 3)
+	ld	de,(iy + 3)  ; Load destination
+	ld	hl,(iy + 6)  ; Load source
 	ldir
 .zero:
-	ld	hl,(iy + 0)
+	ld	hl,(iy + 3)  ; Return the destination pointer
 	ret
 
 end if