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

test/testoffscreen.c

@@ -117,7 +117,7 @@ main(int argc, char *argv[])
                  SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                  width, height, 0);
 
-    if (!window) {
+    if (window == NULL) {
         SDL_Log("Couldn't create window: %s\n",
             SDL_GetError());
         return SDL_FALSE;
@@ -125,7 +125,7 @@ main(int argc, char *argv[])
 
     renderer = SDL_CreateRenderer(window, -1, 0);
 
-    if (!renderer) {
+    if (renderer == NULL) {
         SDL_Log("Couldn't create renderer: %s\n",
             SDL_GetError());
         return SDL_FALSE;