pipewire: assert a nonzero array allocation size

If pw_array_ensure_size() is called on an array that has not been initialized
with an extend, assert. Otherwise we get stuck in an infinite loop since
doubling our zero allocation size will never reach "need".

src/pipewire/array.h

@@ -117,6 +117,7 @@ static inline int pw_array_ensure_size(struct pw_array *arr, size_t size)
 	if (SPA_UNLIKELY(alloc < need)) {
 		void *data;
 		alloc = SPA_MAX(alloc, arr->extend);
+		spa_assert(alloc != 0); /* forgot pw_array_init */
 		while (alloc < need)
 			alloc *= 2;
 		if (SPA_UNLIKELY((data = realloc(arr->data, alloc)) == NULL))