[pdf-tasks] [flyspray] Fix errors reported by the code static analysis

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FS#110 - Fix errors reported by the code static analysis
User who did this: Jose E. Marchesi (jemarch)
Task details edited:
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The code static analysis report shows a list of potential problems detected 
after having analyzed the source code:

http://www.gnupdf.org/prmgt/clang

Lots of them are just dead-stores, like assigning a value to a variable which 
is then never used. But some of them are quite critical like 
NULL-dereferencings or use of uninitialized values.

This task is quite easy, and can be taken by any new contributor.

Since the report is re-generated every day and new problems can arise, please 
don't take the ownership of this task or change its status.  Just fix specific 
problems and send the patches to address@hidden

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http://gnupdf.org/flyspray/index.php?do=details&task_id=110

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