libata: can't set force= on subdevice

[Chris Frey]

Hi,

Using kernel 3.2.x (Debian Wheezy) and when setting libata.force= kernel
command line parameters, there seems to be a conflict with the '.'.

For example, with the following boot argument:

	libata.force=ata1.0:udma/44

I get:

	libata: Unknown parameter '0:udma/44'
	libata: Unknown parameter '0:udma/44'
	libata: Unknown parameter '0:udma/44'
	libata: Unknown parameter '0:udma/44'

Which I think is from kernel/params.c, not drivers/ata/libata-core.c.

- Chris

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