tidy-up: avoid (()), clang-format fixes and more

- drop redundant parentheses from macro definitions.
- apply clang-format in some places missed earlier.
- wolfssl: fix a macro guard comment.
- curl_setup.h: drop empty lines
- FAQ: fix C formatting.

Closes #19854

docs/FAQ

@@ -1157,7 +1157,7 @@ FAQ
           struct MemoryStruct *mem = (struct MemoryStruct *)data;
 
           mem->memory = (char *)realloc(mem->memory, mem->size + realsize + 1);
-          if (mem->memory) {
+          if(mem->memory) {
             memcpy(&(mem->memory[mem->size]), ptr, realsize);
             mem->size += realsize;
             mem->memory[mem->size] = 0;