ssb: remove unreachable code

Clean up the following smatch warning:

drivers/ssb/pci.c:917 ssb_pci_sprom_get() warn: ignoring unreachable
code.

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Acked-by: Michael Büsch <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/ssb/pci.c

···
 				err = 0;
 				goto out_free;
 			}
-			pr_warn("WARNING: Invalid SPROM CRC (corrupt SPROM)\n");
 		}
 	}
 	err = sprom_extract(bus, sprom, buf, bus->sprom_size);