[PATCH v2] bitbake: fix wrong usage of format_exc

[Ed Bartosh <ed.bartosh@linux.intel.com>]

From: Ed Bartosh <eduard.bartosh@intel.com>

First parameter of traceback.format_exc is a 'limit' - a number
of stracktraces to format.

Passing exception object to format_exc is incorrect, but it works in
Python 2 as this code from traceback module works:
    while tb is not None and (limit is None or n < limit):
Comparing integer counter n with the exception object in Python 2
always results in True. However, in Python 3 it throws exception:
    TypeError: unorderable types: int() < <Exception type>()

As format_exc is used in except block of handling another
exception this can cause hard to find and debug bugs.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
---
 lib/bb/cooker.py     | 2 +-
 lib/bb/ui/uievent.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/bb/cooker.py b/lib/bb/cooker.py
index 2154ef4..08dc1fb 100644
--- a/lib/bb/cooker.py
+++ b/lib/bb/cooker.py
@@ -330,7 +330,7 @@ class BBCooker:
                                 f.write("%s\n" % json.dumps({"class":event.__module__ + "." + event.__class__.__name__, "vars":json.dumps(pickle.dumps(event)) }))
                             except Exception as e:
                                 import traceback
-                                print(e, traceback.format_exc(e))
+                                print(e, traceback.format_exc())
 
 
                     def send(self, event):
diff --git a/lib/bb/ui/uievent.py b/lib/bb/ui/uievent.py
index ca19166..9542b91 100644
--- a/lib/bb/ui/uievent.py
+++ b/lib/bb/ui/uievent.py
@@ -116,7 +116,7 @@ class BBUIEventQueue:
                 self.server.handle_request()
             except Exception as e:
                 import traceback
-                logger.error("BBUIEventQueue.startCallbackHandler: Exception while trying to handle request: %s\n%s" % (e, traceback.format_exc(e)))
+                logger.error("BBUIEventQueue.startCallbackHandler: Exception while trying to handle request: %s\n%s" % (e, traceback.format_exc()))
 
         self.server.server_close()
 
-- 
2.1.4