thread: code style

src/thread/windows/SDL_syscond_cv.c

@@ -96,7 +96,7 @@ SDL_CreateCond_cv(void)
 static void
 SDL_DestroyCond_cv(SDL_cond * cond)
 {
-    if (cond) {
+    if (cond != NULL) {
         /* There are no kernel allocated resources */
         SDL_free(cond);
     }

src/thread/windows/SDL_sysmutex.c

@@ -74,7 +74,7 @@ SDL_CreateMutex_srw(void)
 static void
 SDL_DestroyMutex_srw(SDL_mutex * mutex)
 {
-    if (mutex) {
+    if (mutex != NULL) {
         /* There are no kernel allocated resources */
         SDL_free(mutex);
     }
@@ -176,7 +176,7 @@ SDL_CreateMutex_cs(void)
 
     /* Allocate mutex memory */
     mutex = (SDL_mutex_cs *) SDL_malloc(sizeof(*mutex));
-    if (mutex) {
+    if (mutex != NULL) {
         /* Initialize */
         /* On SMP systems, a non-zero spin count generally helps performance */
 #if __WINRT__
@@ -195,7 +195,7 @@ static void
 SDL_DestroyMutex_cs(SDL_mutex * mutex_)
 {
     SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
-    if (mutex) {
+    if (mutex != NULL) {
         DeleteCriticalSection(&mutex->cs);
         SDL_free(mutex);
     }

src/thread/windows/SDL_syssem.c

@@ -96,7 +96,7 @@ SDL_CreateSemaphore_atom(Uint32 initial_value)
     SDL_sem_atom *sem;
 
     sem = (SDL_sem_atom *) SDL_malloc(sizeof(*sem));
-    if (sem) {
+    if (sem != NULL) {
         sem->count = initial_value;
     } else {
         SDL_OutOfMemory();
@@ -107,7 +107,7 @@ SDL_CreateSemaphore_atom(Uint32 initial_value)
 static void
 SDL_DestroySemaphore_atom(SDL_sem * sem)
 {
-    if (sem) {
+    if (sem != NULL) {
         SDL_free(sem);
     }
 }
@@ -269,7 +269,7 @@ SDL_CreateSemaphore_kern(Uint32 initial_value)
 
     /* Allocate sem memory */
     sem = (SDL_sem_kern *) SDL_malloc(sizeof(*sem));
-    if (sem) {
+    if (sem != NULL) {
         /* Create the semaphore, with max value 32K */
 #if __WINRT__
         sem->id = CreateSemaphoreEx(NULL, initial_value, 32 * 1024, NULL, 0, SEMAPHORE_ALL_ACCESS);
@@ -293,7 +293,7 @@ static void
 SDL_DestroySemaphore_kern(SDL_sem * _sem)
 {
     SDL_sem_kern *sem = (SDL_sem_kern *)_sem;
-    if (sem) {
+    if (sem != NULL) {
         if (sem->id) {
             CloseHandle(sem->id);
             sem->id = 0;