tidy-up: miscellaneous

- cmake/Find*: make double quotes consistent.
- drop redundant parenthesis.
- GHA/checksrc: sync a step name with others.
- whitespace.

Closes #19233

include/curl/curl.h

@@ -401,12 +401,12 @@ typedef int (*curl_seek_callback)(void *instream,
 #define CURL_TRAILERFUNC_ABORT 1
 
 typedef size_t (*curl_read_callback)(char *buffer,
-                                      size_t size,
-                                      size_t nitems,
-                                      void *instream);
+                                     size_t size,
+                                     size_t nitems,
+                                     void *instream);
 
 typedef int (*curl_trailer_callback)(struct curl_slist **list,
-                                      void *userdata);
+                                     void *userdata);
 
 typedef enum {
   CURLSOCKTYPE_IPCXN,  /* socket created for a specific IP connection */