pktgen: remove unnecessary break after goto

Signed-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/pktgen.c

@@ -804,7 +804,6 @@ static int strn_len(const char __user * user_buffer, unsigned int maxlen)
 		case '\t':
 		case ' ':
 			goto done_str;
-			break;
 		default:
 			break;
 		}