[2.7] bpo-36186: Fix linuxaudiodev.linux_audio_device() error handling (GH-12163)

Fix linuxaudiodev.linux_audio_device() error handling:
close the internal file descriptor if it fails to open the device.

Misc/NEWS.d/next/Library/2019-03-04-16-39-16.bpo-36186.Hqw1A_.rst

+Fix linuxaudiodev.linux_audio_device() error handling: close the internal file descriptor if it fails to open the device.

Modules/linuxaudiodev.c

@@ -126,10 +126,12 @@ newladobject(PyObject *arg)
     }
     if (imode == O_WRONLY && ioctl(fd, SNDCTL_DSP_NONBLOCK, NULL) == -1) {
         PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
+        close(fd);
         return NULL;
     }
     if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {
         PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
+        close(fd);
         return NULL;
     }
     /* Create and initialize the object */