x86/asm: Merge KSTK_ESP() implementations
Commit: 263042e4 ("Save user RSP in pt_regs->sp on SYSCALL64 fastpath") simplified the 64-bit implementation of KSTK_ESP() which is now identical to 32-bit. Merge them into a common definition. No functional change. Signed-off-by:Brian Gerst <brgerst@gmail.com> Signed-off-by:
Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20250303183111.2245129-1-brgerst@gmail.com
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