Coverity fixes from Nelson

Coverity fixes from Nelson

* njsf-merges:
  Fix stupid strncat usage mistake Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure a pointer to the local ures is not returned, but a copy instead. CID:199 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure to fclose the file on error CID:195 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure to use add.*_rune_noret when not interested on the return value.. CID:175,177,190 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure that the args array is initialized CID:394 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure dl.top_clip is initialized CID:406 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Avoid doing decode_buffer twice when not doing clash detection CID:430 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Remove unneeded initialization of command_builder pointer. CID:431 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Do not assign the return of setlocale(LC_ALL,"C") to locale var since it will be no longer used afterwards. CID:432 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Remove unused value of eckey CID:435 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure that check and change of state is done on the mutual exclusion zone. move the sleep outside of it. CID:440
  make sure the optable_index cannot be negative, instead an assertion is made. CID:117,116,115,114,111,110,109,88,87 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure avfc is not NULL before dereferencing CID:457 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure that avfc is non null before de-reference. CID:458 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure the pointers are valid before dereferencing CID:461 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Use strncat instead of strcat, even in a paranoid fashion. CID:463 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>
  Make sure that mtp has the proper play state before entering the loop. CID:466 Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>