[PATCH] selftests/memfd: clean Makefile

[Chen Linxuan <chenlinxuan@uniontech.com>]

When writing a test for fusectl, I referred to this Makefile as a
reference for creating a FUSE daemon in the selftests.
While doing so, I noticed that there is a minor issue in the Makefile.

The fuse_mnt.c file is not actually compiled into fuse_mnt.o,
and the code setting CFLAGS for it never takes effect.
The reason fuse_mnt compiles successfully is because CFLAGS is set
at the very beginning of the file.

Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
---
 tools/testing/selftests/memfd/Makefile | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/testing/selftests/memfd/Makefile b/tools/testing/selftests/memfd/Makefile
index 163b6f68631c4..e9b886c65153d 100644
--- a/tools/testing/selftests/memfd/Makefile
+++ b/tools/testing/selftests/memfd/Makefile
@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS += -D_FILE_OFFSET_BITS=64
 CFLAGS += $(KHDR_INCLUDES)
 
 TEST_GEN_PROGS := memfd_test
@@ -16,10 +15,9 @@ ifeq ($(VAR_LDLIBS),)
 VAR_LDLIBS := -lfuse -pthread
 endif
 
-fuse_mnt.o: CFLAGS += $(VAR_CFLAGS)
-
 include ../lib.mk
 
+$(OUTPUT)/fuse_mnt: CFLAGS += $(VAR_CFLAGS)
 $(OUTPUT)/fuse_mnt: LDLIBS += $(VAR_LDLIBS)
 
 $(OUTPUT)/memfd_test: memfd_test.c common.c
-- 
2.43.0