[lib][zlib] fix signed vs unsigned comparison
[lib][zlib] fix signed vs unsigned comparison

M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk