dtc: remove extra parentheses to pass clang check

BUG=chromium:230457
TEST=the clang warning is gone

Change-Id: If9536c181d564e6ee3c1b5777dd78ad3a57a16c7
Reviewed-on: https://gerrit.chromium.org/gerrit/47879
Reviewed-by: Han Shen <shenhan@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
diff --git a/checks.c b/checks.c
index 9061237..cefb171 100644
--- a/checks.c
+++ b/checks.c
@@ -620,11 +620,11 @@
 	if (!reg && !ranges)
 		return;
 
-	if ((node->parent->addr_cells == -1))
+	if (node->parent->addr_cells == -1)
 		FAIL(c, "Relying on default #address-cells value for %s",
 		     node->fullpath);
 
-	if ((node->parent->size_cells == -1))
+	if (node->parent->size_cells == -1)
 		FAIL(c, "Relying on default #size-cells value for %s",
 		     node->fullpath);
 }