[PATCH] 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 APIs is a 'limit' - a
number of stracktraces to print.

Passing exception object to print_exc or format_exc is incorrect,
but it works in Python 2 and causes printing only one line of traceback
as exception object is compared with the integer counter in the
traceback module code.

In Python 3 comparison of integer and exception object throws
an 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/ui/uievent.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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