linux-user/strace.c: Correct errno printing for mmap etc
Correct the printing of errnos for syscalls which are handled via print_syscall_ret_addr (mmap, mmap2, brk, shmat): errnos are returned as negative returned values at this level, not via the host 'errno' variable. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>
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