dmaengine: Drop redundant 'else' keyword

It's obvious that 'else' keyword is redundant in the code like

	if (foo)
		return bar;
	else if (baz)
		...

Drop it for good.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200226101842.29426-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>