Crash from an incomplete `do-while` statement

[Daniel-Cortez]

Issue description:

Specifying an incomplete do-while statement without the while (...); part makes the compiler misinterpret further code, which may cause a crash due to calling fgets() with an invalid file handle ((FILE *)0xFFFFFFFF).

Minimal complete verifiable example (MCVE):

main()
{
    do {}
}

Workspace Information:

• Compiler version: 3.10.10
• Command line arguments provided (or sampctl version):
• Operating System:

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