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

test/testshader.c

@@ -139,7 +139,7 @@ static SDL_bool CompileShader(GLhandleARB shader, const char *source)
 
         glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
         info = (char *) SDL_malloc(length + 1);
-        if (!info) {
+        if (info == NULL) {
             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!");
         } else {
             glGetInfoLogARB(shader, length, NULL, info);
@@ -167,7 +167,7 @@ static SDL_bool LinkProgram(ShaderData *data)
 
         glGetObjectParameterivARB(data->program, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
         info = (char *) SDL_malloc(length + 1);
-        if (!info) {
+        if (info == NULL) {
             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!");
         } else {
             glGetInfoLogARB(data->program, length, NULL, info);
@@ -465,7 +465,7 @@ int main(int argc, char **argv)
 
     /* Create a 640x480 OpenGL screen */
     window = SDL_CreateWindow( "Shader Demo", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_OPENGL );
-    if ( !window ) {
+    if (window == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create OpenGL window: %s\n", SDL_GetError());
         SDL_Quit();
         exit(2);
@@ -478,7 +478,7 @@ int main(int argc, char **argv)
     }
 
     surface = SDL_LoadBMP("icon.bmp");
-    if ( ! surface ) {
+    if (surface == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to load icon.bmp: %s\n", SDL_GetError());
         SDL_Quit();
         exit(3);