env: Fix documentation for env_get_f()
This function actually returns: - the number of bytes written into @buf excluding the terminating NULL-byte, if there was enough space in @buf - the number of bytes written into @buf including the terminating NULL-byte, if there wasn't enough space in @buf - -1 if the variable is not found Signed-off-by:Marek Behún <marek.behun@nic.cz> Reviewed-by:
Simon Glass <sjg@chromium.org>
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