mm/early_ioremap: print the starting physical address in __early_ioremap()

mm/early_ioremap: print the starting physical address in __early_ioremap()

The debug WARN() printing occurs after the while loop, so the 'phys_addr'
reflects the last physical address rather than the actual starting
physical address, which is not useful for debugging.  To simplify, the
WARN() statement could be moved up before the loop instead of introducing
a new variable to record the original 'phys_addr' value.  Additionally,
swap the print order of 'slot_virt[slot]' and 'offset', as this will
enhance output readability.

Link: https://lkml.kernel.org/r/aa2d44c34f44c31b50285b7592ed4fd78d6f59ba.1767965415.git.houwenlong.hwl@antgroup.com
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>