Check realloc return value

[radarhere]

Pillow/src/path.c

Lines 340 to 342 in 6a8de89

	/* shrink coordinate array */
	/* malloc check ok, self->count is smaller than it was before */
	self->xy = realloc(self->xy, 2 * self->count * sizeof(double));

The comment comes from 4b4ef5f. It is saying that since we a reallocating to a smaller size, the realloc operation should not fail.

However, perhaps we can satisfy code vulnerability scanners by checking it anyway.