ktime: Simplify ktime_compare implementation

ktime_sub can be used here instread of two conditional checks.
Signed-off-by: Mariusz Skamra <mariuszx.skamra@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@intel.com>
Link: http://lkml.kernel.org/r/1495803647-9504-1-git-send-email-mariuszx.skamra@intel.com

include/linux/ktime.h

@@ -108,11 +108,7 @@ static inline ktime_t timeval_to_ktime(struct timeval tv)
  */
 static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
 {
-	if (cmp1 < cmp2)
-		return -1;
-	if (cmp1 > cmp2)
-		return 1;
-	return 0;
+	return ktime_sub(cmp1, cmp2);
 }
 
 /**