Instead of using a register value, use an AMUX name, as otherwise
VIDIOC_G_AUDIO would fail.
Cc: stable@vger.kernel.org
Fixes: 766ed64de554 ("V4L/DVB (11827): Add support for Terratec Grabster AV350")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
                .input           = { {
                        .type     = EM28XX_VMUX_COMPOSITE,
                        .vmux     = TVP5150_COMPOSITE1,
-                       .amux     = EM28XX_AUDIO_SRC_LINE,
+                       .amux     = EM28XX_AMUX_LINE_IN,
                        .gpio     = terratec_av350_unmute_gpio,
 
                }, {
                        .type     = EM28XX_VMUX_SVIDEO,
                        .vmux     = TVP5150_SVIDEO,
-                       .amux     = EM28XX_AUDIO_SRC_LINE,
+                       .amux     = EM28XX_AMUX_LINE_IN,
                        .gpio     = terratec_av350_unmute_gpio,
                } },
        },