ARM: tegra: gpio: Fix unused variable warnings

Change b0f18eda
(arm: tegra: Remove unused bogus irq enable/disable magic)
introduces warnings:
arch/arm/mach-tegra/gpio.c: In function 'tegra_gpio_resume':
arch/arm/mach-tegra/gpio.c:260: warning: unused variable 'i'
arch/arm/mach-tegra/gpio.c: In function 'tegra_gpio_suspend':
arch/arm/mach-tegra/gpio.c:283: warning: unused variable 'i'

Fix them, and fix a coding style issue on the same lines.

Signed-off-by: Colin Cross <ccross@android.com>
Acked-by: Erik Gilling <konkers@konkers.net>