examples: zephyr: Switch main return type from void to int #28
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Zephyr requires now a int main return.
This fixes build warning:
zephy_rpmsg_multi_services/openamp-system-reference/examples/zephyr/rpmsg_multi_services/src/main_remote.c:480:6: warning: return type of 'main' is not 'int' [-Wmain]
480 | void main(void)
| ^~~~