self-test: fix make clean

thuge-gen was forgotten.  Fix it by removing the duplication, so we don't
get too many repeats.

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/testing/selftests/vm/Makefile

@@ -2,8 +2,9 @@
 
 CC = $(CROSS_COMPILE)gcc
 CFLAGS = -Wall
+BINARIES = hugepage-mmap hugepage-shm map_hugetlb thuge-gen
 
-all: hugepage-mmap hugepage-shm  map_hugetlb thuge-gen
+all: $(BINARIES)
 %: %.c
 	$(CC) $(CFLAGS) -o $@ $^
 
@@ -11,4 +12,4 @@ run_tests: all
 	@/bin/sh ./run_vmtests || (echo "vmtests: [FAIL]"; exit 1)
 
 clean:
-	$(RM) hugepage-mmap hugepage-shm  map_hugetlb
+	$(RM) $(BINARIES)