linux 5.15.y: Update fsync backport for new futex dir hierarchy

Fixes https://github.com/Frogging-Family/linux-tkg/issues/683

linux-tkg-patches/5.15/0007-v5.15-fsync.patch

@@ -68,7 +68,7 @@ Signed-off-by: André Almeida <andrealmeid@collabora.com>
 Adjusted for v5.9: Removed `put_futex_key` calls.
 ---
  include/uapi/linux/futex.h |  20 +++
- kernel/futex.c             | 348 +++++++++++++++++++++++++++++++++++++
+ kernel/futex/core.c             | 348 +++++++++++++++++++++++++++++++++++++
  2 files changed, 368 insertions(+)
 
 diff --git a/include/uapi/linux/futex.h b/include/uapi/linux/futex.h
@@ -114,10 +114,10 @@ index a89eb0accd5e2e..580001e89c6cae 100644
 +};
 +
  #endif /* _UAPI_LINUX_FUTEX_H */
-diff --git a/kernel/futex.c b/kernel/futex.c
+diff --git a/kernel/futex/core.c b/kernel/futex/core.c
 index 408cad5e89680f..c30930a955cece 100644
---- a/kernel/futex.c
-+++ b/kernel/futex.c
+--- a/kernel/futex/core.c
++++ b/kernel/futex/core.c
 @@ -197,6 +197,8 @@ struct futex_pi_state {
   * @bitset:		bitset for the optional bitmasked wakeup
   * @requeue_state:	State field for futex_requeue_pi()
@@ -536,7 +536,7 @@ Subject: [PATCH] futex: Add Proton compatibility code
 
 ---
  include/uapi/linux/futex.h | 2 +-
- kernel/futex.c             | 3 ++-
+ kernel/futex/core.c             | 3 ++-
  2 files changed, 3 insertions(+), 2 deletions(-)
 
 diff --git a/include/uapi/linux/futex.h b/include/uapi/linux/futex.h
@@ -552,10 +552,10 @@ index 580001e89c6cae..a3e760886b8e7e 100644
 
  #define FUTEX_PRIVATE_FLAG	128
  #define FUTEX_CLOCK_REALTIME	256
-diff --git a/kernel/futex.c b/kernel/futex.c
+diff --git a/kernel/futex/core.c b/kernel/futex/core.c
 index c30930a955cece..aa33e66df5c9df 100644
---- a/kernel/futex.c
-+++ b/kernel/futex.c
+--- a/kernel/futex/core.c
++++ b/kernel/futex/core.c
 @@ -4002,7 +4002,7 @@ futex_init_timeout(u32 cmd, u32 op, struct timespec64 *ts, ktime_t *t)
  		return -EINVAL;