yaml: Add check of allocation for node object

[jtstrs]

Fix potential dereferece of nullptr in case of unsuccessful allocation
of memory for list node

Bug: #7270

Contribution style:

• I have read the contributing guide lines at
  https://docs.suricata.io/en/latest/devguide/contributing/contribution-process.html

Our Contribution agreements:

• I have signed the Open Information Security Foundation contribution agreement at
  https://suricata.io/about/contribution-agreement/ (note: this is only required once)

Changes (if applicable):

• I have updated the User Guide (in doc/userguide/) to reflect the changes made
• I have updated the JSON schema (in etc/schema.json) to reflect all logging changes
  (including schema descriptions)
• I have created a ticket at
  https://redmine.openinfosecfoundation.org/projects/suricata/issues

Link to ticket: https://redmine.openinfosecfoundation.org/issues/7270

Describe changes:

• Add check of node pointers after allocation of memory;
• If memory allocated successfully, behavior do not change;
• If allocation fail, goto fail marker;

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.60%. Comparing base (7ab8334) to head (2799bd2).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11822      +/-   ##
==========================================
+ Coverage   82.58%   82.60%   +0.02%     
==========================================
  Files         914      914              
  Lines      249500   249502       +2     
==========================================
+ Hits       206045   206102      +57     
+ Misses      43455    43400      -55     

Flag	Coverage Δ
fuzzcorpus	60.57% <50.00%> (+0.14%)	⬆️
livemode	18.72% <50.00%> (+<0.01%)	⬆️
pcap	44.09% <50.00%> (+0.02%)	⬆️
suricata-verify	62.02% <50.00%> (+<0.01%)	⬆️
unittests	58.96% <50.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[catenacyber]

We would like the ticket number in the commit message cf https://docs.suricata.io/en/latest/devguide/contributing/code-submission-process.html#commits

Also, I see some unit tests do not check it like ConfNode *parent = ConfNodeNew();

[catenacyber]

Thanks for this report, how did you find it ?

[jtstrs]

Sure, will update it. This issue was found by some static analysis tools

[jufajardini]

Sure, will update it. This issue was found by some static analysis tools

Nice, could you share which one?

[jufajardini]

Replaced by: #11847