lockdep: spin_lock_nest_lock(), checkpatch fixes

fix:

 WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
 #46: FILE: kernel/spinlock.c:326:
 +EXPORT_SYMBOL(_spin_lock_nest_lock);

total: 0 errors, 1 warnings, 26 lines checked

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>