Please backport 2d43cc701b96 to v6.9 and v6.6

[Michael Ellerman]

Hi stable team,

Can you please backport:
  2d43cc701b96 ("powerpc/uaccess: Fix build errors seen with GCC 13/14")

To v6.9 and v6.6.

It was marked for backporting, but hasn't been picked up AFAICS. I'm not
sure if it clashed with the asm_goto_output changes or something. But it
backports cleanly to the current stable branches.

It needs a custom backport for earlier kernels, I'll send those.

cheers