[PATCH] dirmngr: Fix segfault in ldap engine

[Kristian Fiskerstrand]

dirmngr: keyserver --help results in segfault, backtrace on [0]. Patch
attached:

(ks-engine-ldap.c) Fix segfault caused by missing check whether uri is
initialized

Additionally two issues with LDAP support:
(i) --refresh-keys is not implemented , so can't do gpg --keyserver
ldap://keys.domain --refresh-keys @domain
gpg: keyserver refresh failed: Not supported

(ii) No warning is printed if returned list is truncated. 2.0 gives a
gpgkeys: search results exceeded server limit.  First 2 results shown.
2.1 just prints the two records returned with no warning.

References:
[0] http://download.sumptuouscapital.com/gnupg/gnupg-2.1.3-segfault.txt
-- 
----------------------------
Kristian Fiskerstrand
Blog: http://blog.sumptuouscapital.com
Twitter: @krifisk
----------------------------
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