qemu-file: pass errno from qemu_fflush via f->last_error
This is done by almost all callers of qemu_fflush, move the code directly to qemu_fflush. Reviewed-by: NOrit Wasserman <owasserm@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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