[ARM] 4149/1: AT91: Overrun in SAM9 gettimeoffset().

Fix an overrun in the AT91SAM9 gettimeoffset() function.  This causes
the time value returned by gettimeofday() to jump "backwards".

Original patch from Michel Benoit.
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91/at91sam926x_time.c

@@ -30,7 +30,6 @@
  * Returns number of microseconds since last timer interrupt.  Note that interrupts
  * will have been disabled by do_gettimeofday()
  *  'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
- *  'tick' is usecs per jiffy (linux/timex.h).
  */
 static unsigned long at91sam926x_gettimeoffset(void)
 {
@@ -39,7 +38,7 @@ static unsigned long at91sam926x_gettimeoffset(void)
 
 	elapsed = (PIT_PICNT(t) * LATCH) + PIT_CPIV(t);		/* hardware clock cycles */
 
-	return (unsigned long)(elapsed * 1000000) / LATCH;
+	return (unsigned long)(elapsed * jiffies_to_usecs(1)) / LATCH;
 }
 
 /*