Commit 21ae6bb1b2 removed most uses of the
'fctx' variable from the rctx_dispfail() function: it is now only needed
by the FCTXTRACE3() macro. However, when --enable-querytrace is not in
effect, that macro evaluates to a list of UNUSED() macros that does not
include "UNUSED(fctx);". This triggers the following compilation
warning when building without --enable-querytrace:
resolver.c: In function 'rctx_dispfail':
resolver.c:7888:21: warning: unused variable 'fctx' [-Wunused-variable]
7888 | fetchctx_t *fctx = rctx->fctx;
| ^~~~
Fix by adding "UNUSED(fctx);" lines to all FCTXTRACE*() macros. This is
safe to do because all of those macros use the 'fctx' local variable, so
there is no danger of introducing new errors caused by use of undeclared
identifiers.
(cherry picked from commit b645e28167)
08b2c1be44