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SharedBuffer: Fix a denial of service
It's a very bad idea to increment the refcount on behalf of another process. That process may (for either benign or evil reasons) not reference the SharedBuffer, and then we'll be stuck with loads of SharedBuffers until we OOM. Instead, increment the refcount when the buffer is mapped. That way, a buffer is only kept if *someone* has explicitly requested it via get_shared_buffer. Fixes SerenityOS#341
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