kola: fix SIGSEGV in luks.cex test #4338
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This fixes null pointer derefernce when VM starup fails:
```
--- FAIL: luks.cex (5.83s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x75d18a]
```
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This pull request correctly addresses a null pointer dereference in the luks.cex test that occurred when VM startup failed. The change moves the error handling to be immediately after the machine creation call, which prevents a nil machine instance from being used in subsequent operations, thus fixing the panic. The removal of the now-redundant, misplaced error check is also correct. The fix is clear, concise, and effectively resolves the reported issue.
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This fixes null pointer derefernce when VM starup fails: