Fix: DEREF_OF_NULL.RET.LIB in db_ido_mysql/idomysqlconnection.cpp

[Ti-Mis]

Fix: DEREF_OF_NULL.RET.LIB

Problem:
The create_mysql_shim function pointer returned by GetSymbolAddress() may be NULL when the symbol cannot be found in the loaded MySQL shim library. The pointer is called without checking its value, which may result in a null function pointer dereference and process termination.

Solution: Check the create_mysql_shim function pointer before calling it and throw an exception if the symbol is not available.

Signed-off-by: t.mishin@fobos-nt.ru
Signed-off-by: bogdanb@altlinux.org

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