misc/grow_array.h: allow passing zero capacity to GrowArray_Init().
misc/grow_array.h: allow passing zero capacity to GrowArray_Init().

SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn