clang-tidy: drop some redundant conditions reported by misc-redundant-expression

[vszakats]

Not enforced due to false positives, and because in cases a redundant
expression (e.g. encapsulated in a macro) may be preferred.

Ref: https://clang.llvm.org/extra/clang-tidy/checks/misc/redundant-expression.html

[vszakats]

home/runner/work/curl/curl/lib/cf-socket.c:1597:52: error: operator has equivalent nested operands [misc-redundant-expression,-warnings-as-errors]
 1597 |   pfd[0].events = POLLRDNORM | POLLIN | POLLRDBAND | POLLPRI;
      |          

[vszakats]

Not applied to this case (it'd need unwrapping the macro):

curl/lib/vtls/vtls_scache.c

Lines 315 to 320 in 078b303

	if(scache && !GOOD_SCACHE(scache)) {
	failf(data, "transfer would use an invalid scache at %p, denied",
	(void *)scache);
	DEBUGASSERT(0);
	return NULL;
	}