In check_pfn_span(), a 'reason' string is being used to recreate the
caller function name, while printing the warning message.  It is really
unnecessary as the warning message could just be printed inside the caller
depending on the return code.  Currently there are just two callers for
check_pfn_span() i.e __add_pages() and __remove_pages().  Let's clean this
up.

Link: https://lkml.kernel.org/r/20220531090441.170650-1-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>