mm/m68k: fix build warning of unused variable

Fix build warning of unused variable:

  arch/m68k/mm/init.c: In function 'mem_init': arch/m68k/mm/init.c:151:6: warning: unused variable 'i' [-Wunused-variable]
Signed-off-by: NJiang Liu <jiang.liu@huawei.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/m68k/mm/init.c

@@ -146,14 +146,11 @@ void __init print_memmap(void)
 		MLK_ROUNDUP(__bss_start, __bss_stop));
 }
 
-void __init mem_init(void)
+static inline void init_pointer_tables(void)
 {
+#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 	int i;
 
-	/* this will put all memory onto the freelists */
-	free_all_bootmem();
-
-#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 	/* insert pointer tables allocated so far into the tablelist */
 	init_pointer_table((unsigned long)kernel_pg_dir);
 	for (i = 0; i < PTRS_PER_PGD; i++) {
@@ -165,7 +162,13 @@ void __init mem_init(void)
 	if (zero_pgtable)
 		init_pointer_table((unsigned long)zero_pgtable);
 #endif
+}
 
+void __init mem_init(void)
+{
+	/* this will put all memory onto the freelists */
+	free_all_bootmem();
+	init_pointer_tables();
 	mem_init_print_info(NULL);
 	print_memmap();
 }