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/timer/unix/SDL_systimer.c

@@ -115,7 +115,7 @@ SDL_GetTicks64(void)
         return (Uint64)(((Sint64)(now.tv_sec - start_ts.tv_sec) * 1000) + ((now.tv_nsec - start_ts.tv_nsec) / 1000000));
 #elif defined(__APPLE__)
         const uint64_t now = mach_absolute_time();
-        return ((((now - start_mach) * mach_base_info.numer) / mach_base_info.denom) / 1000000);
+        return (((now - start_mach) * mach_base_info.numer) / mach_base_info.denom) / 1000000;
 #else
         SDL_assert(SDL_FALSE);
         return 0;
@@ -157,7 +157,7 @@ SDL_GetPerformanceCounter(void)
         ticks *= 1000000;
         ticks += now.tv_usec;
     }
-    return (ticks);
+    return ticks;
 }
 
 Uint64