https://gitlab.synchro.net/main/sbbs/-/commit/22d5c8a53a3577b45978b6b1
Modified Files:
src/sbbs3/netmail.cpp qwktomsg.cpp
Log Message:
qwk: make sentinel NUL after fread explicit (CIDs 645830, 645831, 645832)

Both qwktomsg.cpp and netmail.cpp over-allocate the QWK message buffer
by one block (calloc-zeroed, never written by fread) so downstream strchr/strlen/strlcpy/SAFECOPY scans always terminate within the
allocation. Coverity can't see the over-allocation invariant and flags SAFECOPY/strListPush/whitespace-loop on the buffer as STRING_NULL or TAINTED_SCALAR. Write the trailing NUL explicitly after each fread so
the sentinel action is visible. No runtime change (calloc already
zeroed it).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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