On CentOS/RHEL 5 64 bit unload module gets SIGSEGV

The line

*(void **)(&func_uninit) = dlsym(*module, ZBX_MODULE_FUNC_UNINIT);

seems to hit a bug in the C compiler that ships with EL 5 and the process received a SIGSEGV. On the other hand this C construction is not very good practice.

I created an small patch that fixes the problem and must be OK in any UNIX dialect.