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JS_ReadBigInt allocates the bigint before reading its limbs. If the input ended partway through, the fail path freed an unused `obj` variable but not the bigint. Free the bigint instead and drop the dead variable. Port of quickjs-ng/quickjs#1840
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If the input ends partway through a bigint, the fail path freed an unused
objbut not the bigint. Shows up under ASan with the added test.Port of quickjs-ng/quickjs#1840