[PATCH] ldb: check result of talloc_get_type in ldb_search_default_callback

[Pavel Reichl]

Hello,

while trying to find out memory leak using talloc_set_name() (which 
turned out not be a good idea at all) I got segfault from 
ldb_search_default_callback() caused by dereferencing NULL pointer (res).

I understand that returned value of talloc_get_type() is not checked for 
NULL often and now I'm also aware of problems connected to using 
talloc_set_name(). However, in my opinion segfault should not happen in 
any case.

Thank you for taking the time to consider attached patch.
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