devil: Fix exit code handling when greping through lsof.

devil/devil/android/device_utils.py

Index: devil/devil/android/device_utils.py
diff --git a/devil/devil/android/device_utils.py b/devil/devil/android/device_utils.py
index 322b9d114a63b592132836cd02f0d9f18ff19e49..0d5fa9f2e53f1285119ddf9af23b5ea4d2e95fb6 100644
--- a/devil/devil/android/device_utils.py
+++ b/devil/devil/android/device_utils.py
@@ -1055,11 +1055,11 @@ class DeviceUtils(object):
     else:
       return output
 
-  def _RunPipedShellCommand(self, script, **kwargs):
+  def _RunPipedShellCommand(self, script, check_return=True, **kwargs):
     PIPESTATUS_LEADER = 'PIPESTATUS: '
 
     script += '; echo "%s${PIPESTATUS[@]}"' % PIPESTATUS_LEADER
-    kwargs.update(shell=True, check_return=True)
+    kwargs.update(shell=True)
     output = self.RunShellCommand(script, **kwargs)
     pipestatus_line = output[-1]
 
@@ -1072,7 +1072,7 @@ class DeviceUtils(object):
     output = output[:-1]
     statuses = [
         int(s) for s in pipestatus_line[len(PIPESTATUS_LEADER):].split()]
-    if any(statuses):
+    if check_return and any(statuses):
       raise device_errors.AdbShellCommandFailedError(
           script, output, status=statuses,
           device_serial=self.serial)
@@ -1370,8 +1370,8 @@ class DeviceUtils(object):
             logging.error(
                 'Hit EBUSY while attempting to make missing directories.')
             logging.error('lsof output:')
-            for l in self._RunPipedShellCommand(
-                'lsof | grep %s' % cmd_helper.SingleQuote(m.group(1))):
+            cmd = 'lsof | grep %s' % cmd_helper.SingleQuote(m.group(1))
+            for l in self._RunPipedShellCommand(cmd, check_return=False):
               logging.error('  %s', l)
           raise
       self._PushFilesImpl(host_device_tuples, all_changed_files)