OMAP2/3 clock: omap2_clk_enable(): fix bugs in clockdomain handling

omap2_clk_enable() should enable a clock's clockdomain before
attempting to enable its parent clock's clockdomain.  Similarly, in
the unlikely event that the parent clock enable fails, the clockdomain
should be disabled.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clock.c

@@ -488,16 +488,17 @@ int omap2_clk_enable(struct clk *clk)
 	if (++clk->usecount > 1)
 		return 0;
 
+	omap2_clkdm_clk_enable(clk->clkdm.ptr, clk);
+
 	if (clk->parent)
 		ret = omap2_clk_enable(clk->parent);
 
 	if (ret != 0) {
 		clk->usecount--;
+		omap2_clkdm_clk_disable(clk->clkdm.ptr, clk);
 		return ret;
 	}
 
-	omap2_clkdm_clk_enable(clk->clkdm.ptr, clk);
-
 	ret = _omap2_clk_enable(clk);
 
 	if (ret != 0) {