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/thread/generic/SDL_syscond.c

@@ -97,7 +97,7 @@ int
 SDL_CondSignal_generic(SDL_cond * _cond)
 {
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
-    if (!cond) {
+    if (cond == NULL) {
         return SDL_InvalidParamError("cond");
     }
 
@@ -122,7 +122,7 @@ int
 SDL_CondBroadcast_generic(SDL_cond * _cond)
 {
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
-    if (!cond) {
+    if (cond == NULL) {
         return SDL_InvalidParamError("cond");
     }
 
@@ -179,7 +179,7 @@ SDL_CondWaitTimeout_generic(SDL_cond * _cond, SDL_mutex * mutex, Uint32 ms)
     SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
     int retval;
 
-    if (!cond) {
+    if (cond == NULL) {
         return SDL_InvalidParamError("cond");
     }
 

src/thread/generic/SDL_syssem.c

@@ -85,7 +85,7 @@ SDL_CreateSemaphore(Uint32 initial_value)
     SDL_sem *sem;
 
     sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
-    if (!sem) {
+    if (sem == NULL) {
         SDL_OutOfMemory();
         return NULL;
     }
@@ -129,7 +129,7 @@ SDL_SemTryWait(SDL_sem * sem)
 {
     int retval;
 
-    if (!sem) {
+    if (sem == NULL) {
         return SDL_InvalidParamError("sem");
     }
 
@@ -149,7 +149,7 @@ SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
 {
     int retval;
 
-    if (!sem) {
+    if (sem == NULL) {
         return SDL_InvalidParamError("sem");
     }
 
@@ -197,7 +197,7 @@ SDL_SemValue(SDL_sem * sem)
 int
 SDL_SemPost(SDL_sem * sem)
 {
-    if (!sem) {
+    if (sem == NULL) {
         return SDL_InvalidParamError("sem");
     }
 

src/thread/generic/SDL_systhread.c

@@ -46,13 +46,13 @@ SDL_SYS_SetupThread(const char *name)
 SDL_threadID
 SDL_ThreadID(void)
 {
-    return (0);
+    return 0;
 }
 
 int
 SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
 {
-    return (0);
+    return 0;
 }
 
 void