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/core/windows/SDL_immdevice.c

@@ -136,7 +136,7 @@ SDL_IMMDevice_Add(const SDL_bool iscapture, const char *devname, WAVEFORMATEXTEN
     }
 
     devidlist = (DevIdList *)SDL_malloc(sizeof(*devidlist));
-    if (!devidlist) {
+    if (devidlist == NULL) {
         return;  /* oh well. */
     }
 
@@ -442,7 +442,7 @@ EnumerateEndpointsForFlow(const SDL_bool iscapture)
     }
 
     items = (EndpointItem *)SDL_calloc(total, sizeof(EndpointItem));
-    if (!items) {
+    if (items == NULL) {
         return;  /* oh well. */
     }