C overbound char (asm)

    .file    "main.c"
    .text
    .section .rodata.str1.1,"aMS",@progbits,1
.LC0:
    .string  "%d\n"
    .section .text.startup,"ax",@progbits
    .globl   main
    .type    main, @function
main:
.LFB3:
    .cfi_startproc
    subq     $8, %rsp
    .cfi_def_cfa_offset 16
    movl     $-1, %esi
    movl     $.LC0, %edi
    xorl     %eax, %eax
    call     printf
    xorl     %eax, %eax
    addq     $8, %rsp
    .cfi_def_cfa_offset 8
    ret
    .cfi_endproc
.LFE3:
    .size     main, .-main
    .ident    "GCC: (nb4 20200810) 7.5.0"