ARM: OMAP: Fix compiler warning

Fix the following compiler warning (only visible with
CONFIG_OMAP_RESET_CLOCKS):

arch/arm/mach-omap1/clock.c: In function 'omap1_clk_disable_unused':
arch/arm/mach-omap1/clock.c:634: warning: 'return' with a value, in
function returning void
Signed-off-by: Andrzej Zaborowski <balrog@zabor.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/clock.c

@@ -494,7 +494,7 @@ static int omap1_clk_enable_generic(struct clk *clk)
 		}
 	}
 
-	return 0;
+	return;
 }
 
 static void omap1_clk_disable_generic(struct clk *clk)