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/testviewport.c

@@ -103,8 +103,9 @@ loop()
     int i;
 #ifdef __EMSCRIPTEN__
     /* Avoid using delays */
-    if(SDL_GetTicks() - wait_start < 1000)
+    if (SDL_GetTicks() - wait_start < 1000) {
         return;
+    }
     wait_start = SDL_GetTicks();
 #endif
     /* Check for events */
@@ -121,8 +122,9 @@ loop()
     SDL_Log("Current Viewport x=%i y=%i w=%i h=%i", viewport.x, viewport.y, viewport.w, viewport.h);
 
     for (i = 0; i < state->num_windows; ++i) {
-        if (state->windows[i] == NULL)
+        if (state->windows[i] == NULL) {
             continue;
+        }
 
         /* Draw using viewport */
         DrawOnViewport(state->renderers[i]);
@@ -153,7 +155,7 @@ main(int argc, char *argv[])
 
     /* Initialize test framework */
     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
-    if (!state) {
+    if (state == NULL) {
         return 1;
     }