[ARM] Kirkwood: make kirkwood_find_tclk() static

Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 966df63..7ec14db 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -849,7 +849,7 @@
  ****************************************************************************/
 int kirkwood_tclk;
 
-int __init kirkwood_find_tclk(void)
+static int __init kirkwood_find_tclk(void)
 {
 	u32 dev, rev;