OMAP2/3 clock: omap2_clk_enable(): refactor usecount check

Clean up omap2_clk_enable() by moving most of the function body out of
the usecount check.  Should result in no functional change.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clock.c

@@ -485,7 +485,9 @@ int omap2_clk_enable(struct clk *clk)
 {
 	int ret = 0;
 
-	if (clk->usecount++ == 0) {
+	if (++clk->usecount > 1)
+		return 0;
+
 	if (clk->parent)
 		ret = omap2_clk_enable(clk->parent);
 
@@ -506,7 +508,6 @@ int omap2_clk_enable(struct clk *clk)
 			clk->usecount--;
 		}
 	}
-	}
 
 	return ret;
 }