arm: tegra: fix error check in tegra2_clocks.c
arm: tegra: fix error check in tegra2_clocks.c

Checking 'rate < 0' doesn't work because 'rate' is unsigned.

Signed-off-by: Nicolas Kaiser <9c6450bbb5dc3209f15f8bb98630c23e1d8365d1@nikai.net>
Signed-off-by: Colin Cross <380081620a7947c89c11153c5513f34019caa923@android.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas