Just a small patch that fixes a small parameter validation bug.

  drivers/usb/input/map_to_7segment.h:
    This patch fixes the broken parameter validation in the char to seg7
    conversion. This could cause out-of-bounds memory references.

  MAINTAINERS:
    Yealink maintainer info now in sorted order.

  Documentation/input/yealink.txt:
    Added a Q&A section that answers some common questions.
Signed-off-by: NHenk <Henk.Vergonet@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

006491df1a13f85ad245d1039dfdf20e49c394fd