MIPS: Malta: make a needlessly global integer variable static

The variable `mips_revision_corid' is needlessly defined global in
arch/mips/mti-malta/malta-init.c, and this patch makes it static.

Build-tested with malta_defconfig.
Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mips-boards/generic.h

@@ -71,8 +71,6 @@
 
 #define MIPS_REVISION_CORID (((*(volatile u32 *)ioremap(MIPS_REVISION_REG, 4)) >> 10) & 0x3f)
 
-extern int mips_revision_corid;
-
 #define MIPS_REVISION_SCON_OTHER	   0
 #define MIPS_REVISION_SCON_SOCITSC	   1
 #define MIPS_REVISION_SCON_SOCITSCP	   2

arch/mips/mti-malta/malta-init.c

@@ -48,7 +48,7 @@ int *_prom_argv, *_prom_envp;
 
 int init_debug = 0;
 
-int mips_revision_corid;
+static int mips_revision_corid;
 int mips_revision_sconid;
 
 /* Bonito64 system controller register base. */