[SDL2] pointer boolean (#8523)

src/thread/generic/SDL_syscond.c

@@ -95,7 +95,7 @@ void SDL_DestroyCond_generic(SDL_cond *_cond)
 int SDL_CondSignal_generic(SDL_cond *_cond)
 {
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
-    if (cond == NULL) {
+    if (!cond) {
         return SDL_InvalidParamError("cond");
     }
 
@@ -119,7 +119,7 @@ int SDL_CondSignal_generic(SDL_cond *_cond)
 int SDL_CondBroadcast_generic(SDL_cond *_cond)
 {
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
-    if (cond == NULL) {
+    if (!cond) {
         return SDL_InvalidParamError("cond");
     }
 
@@ -175,7 +175,7 @@ int SDL_CondWaitTimeout_generic(SDL_cond *_cond, SDL_mutex *mutex, Uint32 ms)
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
     int retval;
 
-    if (cond == NULL) {
+    if (!cond) {
         return SDL_InvalidParamError("cond");
     }
 

src/thread/generic/SDL_sysmutex.c

@@ -107,7 +107,7 @@ int SDL_TryLockMutex(SDL_mutex *mutex)
     int retval = 0;
     SDL_threadID this_thread;
 
-    if (mutex == NULL) {
+    if (!mutex) {
         return 0;
     }
 

src/thread/generic/SDL_syssem.c

@@ -78,7 +78,7 @@ SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
     SDL_sem *sem;
 
     sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
-    if (sem == NULL) {
+    if (!sem) {
         SDL_OutOfMemory();
         return NULL;
     }
@@ -120,7 +120,7 @@ int SDL_SemTryWait(SDL_sem *sem)
 {
     int retval;
 
-    if (sem == NULL) {
+    if (!sem) {
         return SDL_InvalidParamError("sem");
     }
 
@@ -139,7 +139,7 @@ int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
 {
     int retval;
 
-    if (sem == NULL) {
+    if (!sem) {
         return SDL_InvalidParamError("sem");
     }
 
@@ -184,7 +184,7 @@ Uint32 SDL_SemValue(SDL_sem *sem)
 
 int SDL_SemPost(SDL_sem *sem)
 {
-    if (sem == NULL) {
+    if (!sem) {
         return SDL_InvalidParamError("sem");
     }