Small fix for net/irda/Makefile

This Makefile would add irlan/irlan.o to $(obj-m) when selected as
modular, which is wrong. The module will get compiled just fine after
descending into that subdirectory anyway (whereas in the current
directory we have no idea how to build it).

net/irda/Makefile

@@ -22,7 +22,6 @@ endif
 
 obj-$(CONFIG_PROC_FS) += irproc.o
 obj-$(CONFIG_SYSCTL) += irsysctl.o
-obj-$(CONFIG_IRLAN) += irlan/irlan.o
 
 subdir-$(CONFIG_IRLAN) += irlan
 subdir-$(CONFIG_IRNET) += irnet