staging: greybus: fix checkpatch braces not necessary warning

Fix the following warnings:
braces {} are not necessary for any arm of this statement
Signed-off-by: Abdul Rauf <abdulraufmujahid@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/loopback.c

@@ -1037,13 +1037,12 @@ static int gb_loopback_fn(void *data)
 
 		/* Else operations to perform */
 		if (gb->async) {
-			if (type == GB_LOOPBACK_TYPE_PING) {
+			if (type == GB_LOOPBACK_TYPE_PING)
 				error = gb_loopback_async_ping(gb);
-			} else if (type == GB_LOOPBACK_TYPE_TRANSFER) {
+			else if (type == GB_LOOPBACK_TYPE_TRANSFER)
 				error = gb_loopback_async_transfer(gb, size);
-			} else if (type == GB_LOOPBACK_TYPE_SINK) {
+			else if (type == GB_LOOPBACK_TYPE_SINK)
 				error = gb_loopback_async_sink(gb, size);
-			}
 
 			if (error)
 				gb->error++;