opengl: Convert an int to an SDL_bool.

src/video/SDL_egl.c

@@ -959,7 +959,7 @@ SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
             /* On OpenGL ES, the GL_OES_surfaceless_context extension must be
              * present. */
             if (SDL_GL_ExtensionSupported("GL_OES_surfaceless_context")) {
-                _this->gl_allow_no_surface = 1;
+                _this->gl_allow_no_surface = SDL_TRUE;
             }
         } else {
             /* Desktop OpenGL supports it by default from version 3.0 on. */
@@ -969,7 +969,7 @@ SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
                 GLint v = 0;
                 glGetIntegervFunc(GL_MAJOR_VERSION, &v);
                 if (v >= 3) {
-                    _this->gl_allow_no_surface = 1;
+                    _this->gl_allow_no_surface = SDL_TRUE;
                 }
             }
         }

src/video/SDL_sysvideo.h

@@ -378,7 +378,7 @@ struct SDL_VideoDevice
     /* Flag that stores whether it's allowed to call SDL_GL_MakeCurrent()
      * with a NULL window, but a non-NULL context. (Not allowed in most cases,
      * except on EGL under some circumstances.) */
-    int gl_allow_no_surface;
+    SDL_bool gl_allow_no_surface;
 
     /* * * */
     /* Data used by the Vulkan drivers */