[PATCH, gdbsim] Avoid silly crash when no binary is loaded

[Luis Machado]

Hi,

This patch prevents the long-standing crash scenario where we start 
gdbsim and "run" without any binaries. Warnings are issued, but those 
don't prevent the simulator from proceeding with garbage data.

Replacing those warnings with error calls seems to be the most 
appropriate here.

Ok?

Luis
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