Modified Makefile clean target so that removing nonextant files does not fail.
diff --git a/wlan/prima/Makefile b/wlan/prima/Makefile
index 7bd3c27..6062e0b 100644
--- a/wlan/prima/Makefile
+++ b/wlan/prima/Makefile
@@ -11,12 +11,13 @@
 	$(MAKE) INSTALL_MOD_STRIP=1 -C $(KERNEL_SRC) M=$(shell pwd) modules_install
 
 clean::
-	find -type f -iname '*.o' | xargs rm
-	find -type f -iname '*.ko' | xargs rm
-	find -type f -iname '*.mod.o' | xargs rm
-	find -type f -iname '*.mod.c' | xargs rm
-	find -type f -iname '*.cmd' | xargs rm
-	rm -f *.o *.ko *.mod.c *.mod.o *~ .*.cmd Module.symvers
+	find -type f -iname '*.o' | xargs rm || true
+	find -type f -iname '*.ko' | xargs rm || true 
+	find -type f -iname '*.mod.o' | xargs rm || true 
+	find -type f -iname '*.mod.c' | xargs rm || true 
+	find -type f -iname '*.cmd' | xargs rm  || true 
+	find -type f -iname '*.o.cmd' | xargs rm || true 
+	rm -f *.o *.ko *.mod.c *.mod.o *~ .*.cmd Module.symvers || true
 	rm -rf .tmp_versions