touchscreen: Fix sign bug
touchscreen: Fix sign bug

platform_get_irq_byname() can return negative results, it is not seen to
unsigned ts_irq. Make it signed.

Signed-off-by: Kulikov Vasiliy <bf62e7c380ff4449c5c3c5c39150b7660ee28ecb@gmail.com>
Acked-By: Luotao Fu <85ed96e8394e24a331a1a2a9131a782ad665de22@pengutronix.de>
Signed-off-by: Samuel Ortiz <0ba86cb3f08bbb861958e54bd3438887adb4263c@linux.intel.com>

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