staging: greybus: hid: remove braces {} around single statement block

This patch fixes the checkpatch.pl warning:

WARNING: braces {} are not necessary for single statement blocks

This is the only instance of the problem noted by
checkpatch.pl in staging: greybus.
Signed-off-by: Dan Jessie <dtjessie@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20200328222134.19344-1-dtjessie@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/hid.c

@@ -290,9 +290,8 @@ static int gb_hid_parse(struct hid_device *hid)
 	}
 
 	rdesc = kzalloc(rsize, GFP_KERNEL);
-	if (!rdesc) {
+	if (!rdesc)
 		return -ENOMEM;
-	}
 
 	ret = gb_hid_get_report_desc(ghid, rdesc);
 	if (ret) {