ALSA: core: fix buffer overflow in snd_info_get_line()

ALSA: core: fix buffer overflow in snd_info_get_line()

commit ddc64b278a4dda052390b3de1b551e59acdff105 upstream.

snd_info_get_line() documents that its last parameter must be one
less than the buffer size, but this API design guarantees that
(literally) every caller gets it wrong.

Just change this parameter to have its obvious meaning.

Reported-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>