Cleanup add brace (#6545)

* Add braces after if conditions

* More add braces after if conditions

* Add braces after while() conditions

* Fix compilation because of macro being modified

* Add braces to for loop

* Add braces after if/goto

* Move comments up

* Remove extra () in the 'return ...;' statements

* More remove extra () in the 'return ...;' statements

* More remove extra () in the 'return ...;' statements after merge

* Fix inconsistent patterns are xxx == NULL vs !xxx

* More "{}" for "if() break;"  and "if() continue;"

* More "{}" after if() short statement

* More "{}" after "if () return;" statement

* More fix inconsistent patterns are xxx == NULL vs !xxx

* Revert some modificaion on SDL_RLEaccel.c

* SDL_RLEaccel: no short statement

* Cleanup 'if' where the bracket is in a new line

* Cleanup 'while' where the bracket is in a new line

* Cleanup 'for' where the bracket is in a new line

* Cleanup 'else' where the bracket is in a new line

(cherry picked from commit 6a2200823c to reduce conflicts merging between SDL2 and SDL3)

test/testautomation_stdlib.c

@@ -191,7 +191,7 @@ stdlib_getsetenv(void *arg)
   /* Create a random name. This tests SDL_getenv, since we need to */
   /* make sure the variable is not set yet (it shouldn't). */
   do {
-    for(counter = 0; counter < nameLen; counter++) {
+    for (counter = 0; counter < nameLen; counter++) {
       name[counter] = (char)SDLTest_RandomIntegerInRange(65, 90);
     }
     name[nameLen] = '\0';