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bdfReadCharacters: ensure metrics fit into xCharInfo struct We use 32-bit ints to read from the bdf file, but then try to stick into a 16-bit int in the xCharInfo struct, so make sure they won't overflow that range. (From OE-Core rev: 4dd4b96b6d60246338bb30ede9f3ab1b2e757be9) Signed-off-by: Li Zhou <li.zhou@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>