crash: fix spelling mistake "crahskernel" -> "crashkernel"

There is a spelling mistake in a pr_warn message. Fix it.

Link: https://lkml.kernel.org/r/20250418120331.535086-1-colin.i.king@gmail.com


Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>