Updated source to match SDL function prototype style

src/atomic/SDL_atomic.c

@@ -203,8 +203,7 @@ int SDL_AtomicSet(SDL_AtomicInt *a, int v)
 #endif
 }
 
-void *
-SDL_AtomicSetPtr(void **a, void *v)
+void *SDL_AtomicSetPtr(void **a, void *v)
 {
 #ifdef HAVE_MSC_ATOMICS
     return _InterlockedExchangePointer(a, v);
@@ -270,8 +269,7 @@ int SDL_AtomicGet(SDL_AtomicInt *a)
 #endif
 }
 
-void *
-SDL_AtomicGetPtr(void **a)
+void *SDL_AtomicGetPtr(void **a)
 {
 #ifdef HAVE_ATOMIC_LOAD_N
     return __atomic_load_n(a, __ATOMIC_SEQ_CST);