tools: fix atomic_set() definition to set the value correctly

Currently vma test is failing because of the new vma_assert_attached()
assertion. The check is failing because previous refcount_set() inside
vma_mark_attached() is a NoOp. Fix the definition of atomic_set() to
correctly set the value of the atomic.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 9325b8b5a1cb ("tools: add skeleton code for userland testing of VMA logic")
Signed-off-by: Suren Baghdasaryan <[e-mail]>
Reviewed-by: Lorenzo Stoakes <[e-mail]>
Cc: Jann Horn <[e-mail]>
Cc: Liam R. Howlett <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/shared/linux/maple_tree.h

···
 #define atomic_t int32_t
 #define atomic_inc(x) uatomic_inc(x)
 #define atomic_read(x) uatomic_read(x)
-#define atomic_set(x, y) do {} while (0)
+#define atomic_set(x, y) uatomic_set(x, y)
 #define U8_MAX UCHAR_MAX
 #include "../../../../include/linux/maple_tree.h"

tools/testing/vma/linux/atomic.h

···
 #define atomic_t int32_t
 #define atomic_inc(x) uatomic_inc(x)
 #define atomic_read(x) uatomic_read(x)
-#define atomic_set(x, y) do {} while (0)
+#define atomic_set(x, y) uatomic_set(x, y)
 #define U8_MAX UCHAR_MAX
 
 #endif	/* _LINUX_ATOMIC_H */