x86: fix section mismatch in srat_64.c:reserve_hotadd

reserve_hotadd() are only used by __init acpi_numa_memory_affinity_init().
Annotate reserve_hotadd() with __init is the trivial fix.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/mm/srat_64.c

@@ -166,7 +166,8 @@ static inline int save_add_info(void) {return 0;}
  * Both SPARSE and RESERVE need nodes_add information.
  * This code supports one contiguous hot add area per node.
  */
-static int reserve_hotadd(int node, unsigned long start, unsigned long end)
+static int __init
+reserve_hotadd(int node, unsigned long start, unsigned long end)
 {
 	unsigned long s_pfn = start >> PAGE_SHIFT;
 	unsigned long e_pfn = end >> PAGE_SHIFT;