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/testatomic.c

@@ -25,8 +25,7 @@ tf(SDL_bool _tf)
     static const char *t = "TRUE";
     static const char *f = "FALSE";
 
-    if (_tf)
-    {
+    if (_tf) {
        return t;
     }
 
@@ -142,11 +141,13 @@ void runAdder(void)
 
     SDL_AtomicSet(&threadsRunning, NThreads);
 
-    while (T--)
+    while (T--) {
         SDL_CreateThread(adder, "Adder", NULL);
+    }
 
-    while (SDL_AtomicGet(&threadsRunning) > 0)
+    while (SDL_AtomicGet(&threadsRunning) > 0) {
         SDL_SemWait(threadDone);
+    }
 
     SDL_DestroySemaphore(threadDone);