Change: remove redundant inits in print_report_xml_start

[mattmundell]

What

Remove inits of ctx.f_host_* in print_report_xml_start.

I'm making this a very small change, to keep review easier. This function is big and messy.

Why

They are redundant.

ctx is initialized with print_report_context_t ctx = {0};, which ensures that all fields are 0 (which is NULL for pointers).

References

Follows /pull/2776.

Breakdown of /pull/2712.

Testing

I ran GET_REPORTS on branch and main, and compared the output.

o m m '<get_reports report_id="82f3531c-43cd-4453-8300-990dc423d96b" filter="apache levels=hm" details="1"/>' > /tmp/r-pr
o m m '<get_reports report_id="82f3531c-43cd-4453-8300-990dc423d96b" filter="apache levels=hm" details="1"/>' > /tmp/r-main
o m m '<get_reports details="1"/>' > /tmp/r2-pr
o m m '<get_reports details="1"/>' > /tmp/r2-main
diff -u /tmp/r-pr /tmp/r-main
diff -u /tmp/r2-pr /tmp/r2-main