create_brick_ota: logic fix

ota_metadata should be initialized outside of the if block.

Bug: 3072303
Test: th
Change-Id: Iabe52be3557c71921586d960d8a8a91c33d5558b
diff --git a/tools/releasetools/create_brick_ota.py b/tools/releasetools/create_brick_ota.py
index 9e040a5..bf50f71 100644
--- a/tools/releasetools/create_brick_ota.py
+++ b/tools/releasetools/create_brick_ota.py
@@ -45,10 +45,10 @@
   partitions_to_wipe = PARTITIONS_TO_WIPE
   if extra_wipe_partitions is not None:
     partitions_to_wipe = PARTITIONS_TO_WIPE + extra_wipe_partitions.split(",")
-    ota_metadata = ["ota-type=BRICK", "post-timestamp=9999999999",
-                    "pre-device=" + product_name]
-    if serialno is not None:
-        ota_metadata.append("serialno=" + serialno)
+  ota_metadata = ["ota-type=BRICK", "post-timestamp=9999999999",
+                  "pre-device=" + product_name]
+  if serialno is not None:
+      ota_metadata.append("serialno=" + serialno)
   # recovery requiers product name to be a | separated list
   product_name = product_name.replace(",", "|")
   with zipfile.ZipFile(output_path, "w") as zfp: