[Users] [Bug 3857] New: crash when setting a wrong host

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http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3857

            Bug ID: 3857
           Summary: crash when setting a wrong host
    Classification: Unclassified
           Product: Claws Mail
           Version: 3.15.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: critical
          Priority: P3
         Component: Plugins/Clamd
          Assignee: users at lists.claws-mail.org
          Reporter: jiazhouyang09 at gmail.com

Created attachment 1774
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http://www.thewildbeast.co.uk/claws-mail/bugzilla/attachment.cgi?id=1774&action=edit
fix the crash by adding error handling code to gethostbyname

The program will crash when setting a wrong host.

Steps to reproduce:

1. Load the plugin.
Configuration -> Plugins -> Load -> clams.so -> Open -> Close

2. Set a wrong host name.
Configuration -> Preferences -> Plugins -> Clam AntiVirus -> check Enable virus
scanning -> uncheck Automatic configuration -> Remote Host: WrongHost -> Port:
10010 -> Apply

The reason is that there is no error handling code after calling function
"gethostbyname". 

The following patch will solve this problem.

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