[PATCH] time_adjust cleared before use

I notice that the code which implements adjtime clears the time_adjust
value before using it.  The attached patch makes the obvious fix.

Acked-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Jim Houston <jim.houston@ccur.com>
Cc: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>