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Fix dependency on implementation-defined calloc(0) behaviour

Andreas Falkenhahn requested to merge softwarefailure/cairo:softwarefailure-master-patch-58040 into master

Cairo depends on calloc(0) returning a valid memory block but that is not guaranteed because it's implementation-defined. So we should add 1 to num_subs to make sure the code doesn't fail on systems where calloc(0) returns NULL.

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