[soundwave] Make fetch_alerts_data interpret days as an int.

IT currently passes it as a string, which causes problems later when
it is assumed to be an int.

Bug: chromium:769027
Change-Id: I12e5b5ede7e4cca2e7d49fca9fcfd9d61f268667
Reviewed-on: https://chromium-review.googlesource.com/763568
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
diff --git a/experimental/soundwave/fetch_alert_data b/experimental/soundwave/fetch_alert_data
index e4607e5..7118a5f 100755
--- a/experimental/soundwave/fetch_alert_data
+++ b/experimental/soundwave/fetch_alert_data
@@ -32,7 +32,7 @@
   parser = argparse.ArgumentParser()
   parser.add_argument('-b', '--benchmark', required=True,
                       help='Benchmark to pull data for.')
-  parser.add_argument('-d', '--days', default=30,
+  parser.add_argument('-d', '--days', default=30, type=int,
                       help='Number of days to collect data for. Default 30')
   parser.add_argument('--credentials',
                       help=('Path to json credentials file. See %s for '