6502: division with promotion error

[kwhr0]

int func(void) {
        int a = 0x0a0b;
        char b = 0x0c;
        return a / b;
}

_func:
;invalidate regs
        ldy #3
        jsr __subysp
        ldx #10
        lda #11
        pha
        ldy #0
        sta (@sp),y
        txa
        iny
        sta (@sp),y
        pla
;:
        lda #12
        iny
        sta (@sp),y
;:
        dey
        lda (@sp),y
        tax
        dey
        lda (@sp),y
        ldx #0        <---
        sta @tmp
        stx @tmp+1
        ldy #2
        lda (@sp),y
;invalidate regs
        jsr __divtmp
;:
        jmp L0_r
L0_r:
;invalidate regs
        ldy #3
        jmp __addysp

ldx #0 should be after stx @tmp+1.