mfd: omap-usb-tll: Fix cppcheck sizeof warning

Static analysis from cppcheck issued the following warning:

[drivers/mfd/omap-usb-tll.c:255]: (warning) Found calculation
inside sizeof().

The current size calculation is not obvious and is easy to
miscomprehend, so re-work the size of the allocation based
on the size of the struct pointer and quantity to allocate.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/omap-usb-tll.c

···
 		break;
 	}
 
-	tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk * [tll->nch]),
+	tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch,
 						GFP_KERNEL);
 	if (!tll->ch_clk) {
 		ret = -ENOMEM;