[ARM] pxa: don't pass a consumer clock name for devices with unique clocks

Where devices only have one consumer, passing a consumer clock ID
has no real benefit.  Remove it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/pwm.c b/arch/arm/mach-pxa/pwm.c
index 74e2ead..3ca7ffc 100644
--- a/arch/arm/mach-pxa/pwm.c
+++ b/arch/arm/mach-pxa/pwm.c
@@ -173,7 +173,7 @@
 		return ERR_PTR(-ENOMEM);
 	}
 
-	pwm->clk = clk_get(&pdev->dev, "PWMCLK");
+	pwm->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pwm->clk)) {
 		ret = PTR_ERR(pwm->clk);
 		goto err_free;