mm: remove unnecessary whitespace before a quoted newline

Remove whitespaces before newlines for strings in pr_warn_once()

Link: https://lkml.kernel.org/r/20241115235744.1419580-3-kerensun@google.com


Signed-off-by: Keren Sun <kerensun@google.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>