Swarming tests: Fix uninteresting hash file path

TBR=rmistry
NOTRY=true
BUG=skia:4763
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1746063002

Review URL: https://codereview.chromium.org/1746063002

diff --git a/infra/bots/common.py b/infra/bots/common.py
index 6f606d9..24d4996 100644 (file)
--- a/infra/bots/common.py
+++ b/infra/bots/common.py
@@ -296,7 +296,7 @@ class BotInfo(object):
 
       # Obtain the list of already-generated hashes.
       hash_filename = 'uninteresting_hashes.txt'
-      host_hashes_file = self.tmp_dir.join(hash_filename)
+      host_hashes_file = os.path.join(self.tmp_dir, hash_filename)
       hashes_file = self.flavor.device_path_join(
           self.device_dirs.tmp_dir, hash_filename)