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

src/loadso/dummy/SDL_sysloadso.c

@@ -31,7 +31,7 @@ SDL_LoadObject(const char *sofile)
 {
     const char *loaderror = "SDL_LoadObject() not implemented";
     SDL_SetError("Failed loading %s: %s", sofile, loaderror);
-    return (NULL);
+    return NULL;
 }
 
 void *
@@ -39,7 +39,7 @@ SDL_LoadFunction(void *handle, const char *name)
 {
     const char *loaderror = "SDL_LoadFunction() not implemented";
     SDL_SetError("Failed loading %s: %s", name, loaderror);
-    return (NULL);
+    return NULL;
 }
 
 void