chardev: remove qemu_chr_fe_read_all() counter
There is no obvious reason to have a loop counter. This limits from reading several megabytes large buffers in one go, since socket read/write usually have a limit. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
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