[contrib][linux] Fix make import-upstream
diff --git a/contrib/linux-kernel/Makefile b/contrib/linux-kernel/Makefile
index a3593d4..b8a65e9 100644
--- a/contrib/linux-kernel/Makefile
+++ b/contrib/linux-kernel/Makefile
@@ -63,15 +63,8 @@
 	cp -r linux/lib/zstd $(LINUX)/lib
 
 import-upstream:
-	rm -f $(LINUX)/include/linux/zstd.h
-	rm -f $(LINUX)/include/linux/zstd_errors.h
 	rm -rf $(LINUX)/lib/zstd
 	mkdir $(LINUX)/lib/zstd
-	cp linux_zstd.h $(LINUX)/include/linux/zstd.h
-	cp zstd_compress_module.c $(LINUX)/lib/zstd
-	cp zstd_decompress_module.c $(LINUX)/lib/zstd
-	cp decompress_sources.h $(LINUX)/lib/zstd
-	cp linux.mk $(LINUX)/lib/zstd/Makefile
 	cp ../../lib/zstd.h $(LINUX)/lib/zstd
 	cp -r ../../lib/common $(LINUX)/lib/zstd
 	cp -r ../../lib/compress $(LINUX)/lib/zstd