arch/x86/mm/pageattr.c: Quiet sparse noise; local functions should be static

Local functions should be marked static.  This also quiets the
following sparse noise:

  warning: symbol '_set_memory_array' was not declared. Should it be static?
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: hartleys@visionengravers.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/mm/pageattr.c

@@ -998,7 +998,7 @@ int set_memory_uc(unsigned long addr, int numpages)
 }
 EXPORT_SYMBOL(set_memory_uc);
 
-int _set_memory_array(unsigned long *addr, int addrinarray,
+static int _set_memory_array(unsigned long *addr, int addrinarray,
 		unsigned long new_type)
 {
 	int i, j;