Fix glfw crashes when passing null for optional output arguments of some functions (#11157)

Do not write output values when optional output pointer is null for calls of following functions:

    glfwGetFramebufferSize (width/height)
    glfwGetWindowSize (width/height)
    glfwGetWindowPos (x/y)

This is in pair with native GLFW 3.2 implementation and documentation for these functions.

Author: doanamo

AUTHORS

@@ -471,3 +471,4 @@ a license to everyone to use it as detailed in LICENSE.)
 * Shachar Langbeheim <[email protected]>
 * David Carlier <[email protected]>
 * Paul Du <[email protected]> (copyright owned by ARSKAN)
+* Piotr Doan <[email protected]>

src/library_glfw.js

@@ -916,8 +916,13 @@ var LibraryGLFW = {
         wy = win.y;
       }
 
-      setValue(x, wx, 'i32');
-      setValue(y, wy, 'i32');
+      if (x) {
+        setValue(x, wx, 'i32');
+      }
+      
+      if (y) {
+        setValue(y, wy, 'i32');
+      }
     },
 
     setWindowPos: function(winid, x, y) {
@@ -937,8 +942,13 @@ var LibraryGLFW = {
         wh = win.height;
       }
 
-      setValue(width, ww, 'i32');
-      setValue(height, wh, 'i32');
+      if (width) {
+        setValue(width, ww, 'i32');
+      }
+      
+      if (height) {
+        setValue(height, wh, 'i32');
+      }
     },
 
     setWindowSize: function(winid, width, height) {
@@ -1331,9 +1341,14 @@ var LibraryGLFW = {
       ww = win.width;
       wh = win.height;
     }
-
-    setValue(width, ww, 'i32');
-    setValue(height, wh, 'i32');
+    
+    if (width) {
+      setValue(width, ww, 'i32');
+    }
+    
+    if (height) {
+      setValue(height, wh, 'i32');
+    }
   },
 
   glfwIconifyWindow: function(winid) {