[cc65] Linking [s]printf breaks cbm_open?

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Hi!

While playing around with printing I found the following:

As soon as [s]printf is linked to the program, cbm_open always return
oserror=2 (file open). This happens even if [s]printf gets never
executed.

If I ignore the error code and do the cbm_write anyway, the text goes
to the screen instead of the printer.

Unfortunately my knowledge of 6502 assembler is in-existent, so looking
at the library source code didn't help for me.

Regards,
Jakob
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