block: fix rootwait= again

The previous rootwait fix added an -EINVAL return to a completely
bogus superflous branch, fix this.

Fixes: 1341c7d2 ("block: fix rootwait=")
Reported-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230609051737.328930-1-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/early-lookup.c

@@ -181,7 +181,7 @@ static int __init devt_from_devname(const char *name, dev_t *devt)
 	*p = '\0';
 	*devt = blk_lookup_devt(s, part);
 	if (*devt)
-		return -ENODEV;
+		return 0;
 
 	/* try disk name without p<part number> */
 	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')