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Fix use after free when font server connection lost

Peter Harris requested to merge peterh/libxfont:master into master

If there are multiple blocks waiting for the same font, only one of them will have ->freeFont set. The rest will be in a state of FS_DEPENDING.

If the font server dies before the font finishes opening, the block with ->freeFont set will call ->unload_font, invalidating the pfont pointers in the remaining FS_DEPENDING blocks.

Avoid a use after free (and potential crash) by passing conn to fs_cleanup_font instead of dereferencing pfont to find the conn.

Signed-off-by: Peter Harris

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