Fixed crash in the Linux implementation of Joystick, when inotify failed to initialize

src/SFML/Window/Linux/JoystickImpl.cpp

@@ -52,6 +52,8 @@ namespace
     }
 
     bool canRead(int descriptor)
+    {
+        if (descriptor >= 0)
         {
             fd_set set;
             FD_ZERO(&set);
@@ -60,6 +62,11 @@ namespace
             return select(descriptor + 1, &set, NULL, NULL, &timeout) > 0 &&
                    FD_ISSET(notifyFd, &set);
         }
+        else
+        {
+            return false;
+        }
+    }
 }
 
 
@@ -102,7 +109,7 @@ void JoystickImpl::cleanup()
         inotify_rm_watch(notifyFd, inputFd);
 
     // Close the inotify file descriptor
-    if (inputFd >= 0)
+    if (notifyFd >= 0)
         ::close(notifyFd);
 }
 
@@ -120,7 +127,7 @@ bool JoystickImpl::isConnected(unsigned int index)
         while (canRead(notifyFd))
         {
             char buffer[128];
-            read(notifyFd, buffer, sizeof(buffer));
+            (void)read(notifyFd, buffer, sizeof(buffer));
         }
 	}