Fix bug 7967800 native crash in text layout

This patch works around a recent change to bionic that was intented to
throw an assert on null pointer, but actually threw on 0 unicode code
point, because it uses a type pun to cast the unicode code point to a
pointer type.

Change-Id: I6ebf2583201fcf8a39490877b74eceb695b8fcd0
1 file changed