Moved X11 character translation failure test.

src/input.c

@@ -154,9 +154,6 @@ void _glfwInputKey(_GLFWwindow* window, int key, int scancode, int action, int m
 
 void _glfwInputChar(_GLFWwindow* window, unsigned int character)
 {
-    if (character == -1)
-        return;
-
     if (character < 32 || (character > 126 && character < 160))
         return;
 

src/x11_window.c

@@ -520,7 +520,11 @@ static void processEvent(XEvent *event)
             _glfwInputKey(window, key, event->xkey.keycode, GLFW_PRESS, mods);
 
             if (!(mods & GLFW_MOD_CONTROL) && !(mods & GLFW_MOD_ALT))
-                _glfwInputChar(window, translateChar(&event->xkey));
+            {
+                const int character = translateChar(&event->xkey);
+                if (character != -1)
+                    _glfwInputChar(window, character);
+            }
 
             break;
         }