chrome_cr50: fix using_prod_rw_keys

BUG=none
BRANCH=none
TEST=run firmware_Cr50RMAOpen

Change-Id: I2d2f07e3dff19927d0cbf3c8adbb9d199ff0b774
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1549646
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Kevin Shelton <kmshelton@chromium.org>
diff --git a/server/cros/servo/chrome_cr50.py b/server/cros/servo/chrome_cr50.py
index f9b32cf..af96e69 100644
--- a/server/cros/servo/chrome_cr50.py
+++ b/server/cros/servo/chrome_cr50.py
@@ -490,7 +490,7 @@
 
     def using_prod_rw_keys(self):
         """Returns True if the RW keyid is prod"""
-        rv = self.send_safe_command_retry_get_output('sysinfo',
+        rv = self.send_safe_command_get_output('sysinfo',
                 ['RW keyid:.*\(([a-z]+)\)'])
         logging.info(rv)
         return rv[0][1] == 'prod'