fix: quit mvsd with Ctrl+C in debug version leads to coredump.
fix: quit mvsd with Ctrl+C in debug version leads to coredump.

the commit ed6c364 to src/lib/network/proxy.cpp cause this problem

mvs-org/metaverse,mvs-live/metaverse,mvs-org/metaverse,the-metaverse/metaverse,mvs-org/metaverse,the-metaverse/metaverse,the-metaverse/metaverse,mvs-org/metaverse,mvs-live/metaverse,mvs-org/metaverse,mvs-org/metaverse