improve load_rom error handling
#24
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This commit fixes the singular, long-standing compiler warning of ignoring the return value of `fread`. It also catches more file errors and exits the program on failure, to match with `new_disk`.
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This commit fixes the singular, long-standing compiler warning of ignoring the return value of
fread. It also catches more file errors and exits the program on failure, to match withnew_disk.