[SPARC]: atomic_clear_mask build fix

This fixes one build error introduced in sparc with the patch of Oct 30,
resent Nov 4 "[patch 3/5] atomic: atomic_inc_not_zero" I still can't get
sparc to build, but at least it gets further after I remove this line. 
Apparently, this change was agreed to by Andrew and Nick on Nov 14, but
everyone thought someone else was doing it.
Signed-off-by: NPaul Jackson <pj@sgi.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/lib/atomic32.c

@@ -66,7 +66,6 @@ int atomic_add_unless(atomic_t *v, int a, int u)
 	return ret != u;
 }
 
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 /* Atomic operations are already serializing */
 void atomic_set(atomic_t *v, int i)
 {