libata: fix spelling mistake: 'ambigious' -> 'ambiguous'

Trivial fix to spelling mistakes in ata_parse_force_one().
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NTejun Heo <tj@kernel.org>

drivers/ata/libata-core.c

@@ -6908,7 +6908,7 @@ static int __init ata_parse_force_one(char **cur,
 		return -EINVAL;
 	}
 	if (nr_matches > 1) {
-		*reason = "ambigious value";
+		*reason = "ambiguous value";
 		return -EINVAL;
 	}