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bdfReadCharacters: bailout if a char's bitmap cannot be read Previously would charge on ahead with a NULL pointer in ci->bits, and then crash later in FontCharInkMetrics() trying to access the bits. (From OE-Core rev: 2c7a15a074501beb6b8a4c7bdf30604b1a432a6b) (From OE-Core rev: 7827e9756e82c31707ce87d27c7d0b0392fc0812) Signed-off-by: Li Zhou <li.zhou@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>