I spotted this whitespace error during the review of
https://gcc.gnu.org/pipermail/gcc-patches/2024-April/648846.html.

Pushing as obvious after testing on aarch64-linux-gnu.

Thanks,
Alex

gcc/ChangeLog:

	* config/aarch64/aarch64-ldp-fusion.cc (struct alias_walker):
	Fix double space after const qualifier on valid ().