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Tilman Schmidt authored
The tty_operation chars_in_buffer() is not allowed to return a negative value to signal an error. Corrects the problem flagged by commit 23198fda, "tty: fix chars_in_buffers". Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: "David S. Miller" <davem@davemloft.net> Cc: stable <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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