[Pidgin] #7761: Fixes for libpurple to avoid segfaults

[Pidgin]

#7761: Fixes for libpurple to avoid segfaults
--------------------+-------------------------------------------------------
 Reporter:  vadiml  |        Owner:  datallah 
     Type:  patch   |       Status:  new      
Milestone:  2.5.4   |    Component:  libpurple
  Version:  2.5.2   |   Resolution:           
 Keywords:          |  
--------------------+-------------------------------------------------------

Comment(by darkrain42):

 The full backtrace is >10000 entries (and crashed gdb when I tried to get
 just the last 100. I think I ran it OOM).

 The debug window must be enabled in order for it to crash (sorry, I missed
 that). It will then crash because `pidgin_debug_is_enabled` tries to call
 `purple_prefs_get_bool(PIDGIN_PREFS_ROOT "/debug/enabled")`.

 {{{
 (08:57:58) prefs: removing pref /pidgin/debug/enabled
 (08:57:58) prefs: removing pref /pidgin/debug/filterlevel
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 (08:57:58) prefs: purple_prefs_get_bool: Unknown pref
 /pidgin/debug/enabled
 etc...
 }}}
 and eventually runs out of stack.

-- 
Ticket URL: <http://developer.pidgin.im/ticket/7761#comment:15>
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