[ALSA] trivial clean up of sound/isa/sb/Makefile

Remove unneeded sort in sound/isa/sb/Makefile.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/isa/sb/Makefile b/sound/isa/sb/Makefile
index c9d1c98..1098a56 100644
--- a/sound/isa/sb/Makefile
+++ b/sound/isa/sb/Makefile
@@ -34,5 +34,3 @@
   obj-$(CONFIG_SND_SBAWE) += snd-sb16-csp.o
 endif
 obj-$(call sequencer,$(CONFIG_SND_SBAWE)) += snd-emu8000-synth.o
-
-obj-m := $(sort $(obj-m))