[ATM]: Spelling fixes

Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/firestream.c

@@ -171,8 +171,8 @@ static char *res_strings[] = {
 	"packet purged", 
 	"packet ageing timeout", 
 	"channel ageing timeout", 
-	"calculated lenght error", 
-	"programmed lenght limit error", 
+	"calculated length error", 
+	"programmed length limit error", 
 	"aal5 crc32 error", 
 	"oam transp or transpc crc10 error", 
 	"reserved 25",