[TG3] tg3_bus_string(): remove dead code

The Coverity checker spotted this dead code (note that (clock_ctrl == 7) 
is already handled above).

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 1554562..b8f1524 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -10543,8 +10543,6 @@
 			strcat(str, "66MHz");
 		else if (clock_ctrl == 6)
 			strcat(str, "100MHz");
-		else if (clock_ctrl == 7)
-			strcat(str, "133MHz");
 	} else {
 		strcpy(str, "PCI:");
 		if (tp->tg3_flags & TG3_FLAG_PCI_HIGH_SPEED)