[PATCH] nDL_GSM handling (as discussed)

[Andy Green]

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Somebody in the thread at some point said:

| +			if (on)
| +			    disable_irq(gpio_to_irq(GTA02_GPIO_JACK_INSERT));
| +			else
| +			    enable_irq(gpio_to_irq(GTA02_GPIO_JACK_INSERT));

Holger, great patches you have sent.

This bit above made troubles though -- it can cause "Unbalanced IRQ"
errors depending on what userspace sends down the /sys node, since it
will just go ahead and enable or disable the IRQ without considering the
existing state.

I added a patch on top of this which re-uses the gta01_gsm.gpio_ndl_gsm
state to figure out if it needs to do anything and it stops the warning
and kernel stack trace from the "unbalanced IRQ".

- -Andy
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