Remove extra parentheses to pass clang checking.

BUG=chromium:219220
TEST=emerge-lumpy flashmap, the error message is gone.

Change-Id: I5fe8b5c9f1b6802d2487b57b96e93ba2e4e7c226
Reviewed-on: https://gerrit.chromium.org/gerrit/47368
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
diff --git a/lib/fmap.c b/lib/fmap.c
index 8850a92..5022434 100644
--- a/lib/fmap.c
+++ b/lib/fmap.c
@@ -223,7 +223,7 @@
 	int fmap_offset;
 	SHA_CTX ctx;
 
-	if ((image == NULL))
+	if (image == NULL)
 		return -1;
 
 	if ((fmap_offset = fmap_find(image, image_len)) < 0)