Fix OSS API emulation when sound is compiled as a module

sound/core/Config.in

@@ -13,7 +13,7 @@ dep_tristate '  Sequencer support' CONFIG_SND_SEQUENCER $CONFIG_SND
 if [ "$CONFIG_SND_SEQUENCER" != "n" ]; then
   dep_tristate '  Sequencer dummy client' CONFIG_SND_SEQ_DUMMY $CONFIG_SND_SEQUENCER
 fi
-dep_bool '  OSS API emulation' CONFIG_SND_OSSEMUL $CONFIG_SND
+dep_mbool '  OSS API emulation' CONFIG_SND_OSSEMUL $CONFIG_SND
 if [ "$CONFIG_SND_OSSEMUL" = "y" ]; then
   dep_tristate '    OSS Mixer API' CONFIG_SND_MIXER_OSS $CONFIG_SND
   dep_tristate '    OSS PCM API' CONFIG_SND_PCM_OSS $CONFIG_SND