src/lib: Wrap lines at 80 columns

Fix the following warning detected by checkpatch.pl:

WARNING: line over 80 characters

TEST=Build and run on Galileo Gen2

Change-Id: I5fa3f8e950e2f0c60bd0e8f030342dc8c0469299
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18758
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/lib/thread.c

@@ -226,7 +226,8 @@ static void idle_thread_init(void)
 /* Don't inline this function so the timeout_callback won't have its storage
  * space on the stack cleaned up before the call to schedule(). */
 static int __attribute__((noinline))
-thread_yield_timed_callback(struct timeout_callback *tocb, unsigned int microsecs)
+thread_yield_timed_callback(struct timeout_callback *tocb,
+	unsigned int microsecs)
 {
 	tocb->priv = current_thread();
 	tocb->callback = thread_resume_from_timeout;