lib, net: make isodigit() public and use it

There are at least two users of isodigit().  Let's make it a public
function of ctype.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
msm_hotplug: remove lcd_notify events

Should make hotplugging less agressive at screen on/off
events.

Thanks to myfluxi and neobudy89.

Signed-off-by: Dan Trifan <jimsth@gmail.com>