Cocoa: Fix AirPlay causing harmless init error

Emitting an error for one specific type of failure in retrieving the
correct name for a display is not very useful, especially when
initialization is otherwise unaffected.

There should be a path for information like that but this isn't it.

Fixes #1791

(cherry picked from commit 955fbd9d26)

CONTRIBUTORS.md

@@ -88,6 +88,7 @@ video tutorials.
  - InKryption
  - IntellectualKitty
  - Aaron Jacobs
+ - JannikGM
  - Erik S. V. Jansson
  - jjYBdx4IL
  - Toni Jovanoski

README.md

@@ -128,6 +128,7 @@ information on what to include when reporting a bug.
  - [Win32] Bugfix: `GLFW_KEY_PAUSE` scancode from `glfwGetKeyScancode` did not
    match event scancode (#1993)
  - [Win32] Bugfix: Instance-local operations used executable instance (#469,#1296,#1395)
+ - [Cocoa] Bugfix: A connected Apple AirPlay would emit a useless error (#1791)
 
 
 ## Contact

src/cocoa_monitor.m

@@ -98,11 +98,7 @@ static char* getMonitorName(CGDirectDisplayID displayID, NSScreen* screen)
     IOObjectRelease(it);
 
     if (!service)
-    {
-        _glfwInputError(GLFW_PLATFORM_ERROR,
-                        "Cocoa: Failed to find service port for display");
         return _glfw_strdup("Display");
-    }
 
     CFDictionaryRef names =
         CFDictionaryGetValue(info, CFSTR(kDisplayProductName));