Fix jiffies.h comment

jiffies.h includes a comment informing that jiffies_64 must be read with the
assistance of the xtime_lock seqlock. The comment text, however, calls
jiffies_64 "not volatile", which should probably read "not atomic".

Signed-off-by: Chase Venters <chase.venters@clientec.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

include/linux/jiffies.h

@@ -74,7 +74,7 @@
 #define __jiffy_data  __attribute__((section(".data")))
 
 /*
- * The 64-bit value is not volatile - you MUST NOT read it
+ * The 64-bit value is not atomic - you MUST NOT read it
  * without sampling the sequence number in xtime_lock.
  * get_jiffies_64() will do this for you as appropriate.
  */