ssh: fix spelling of test so that it runs

Change-Id: I65ebae299f272d5f1367ca4c2e47e51f9c392b6a
Reviewed-on: https://go-review.googlesource.com/12229
Reviewed-by: Dave Cheney <dave@cheney.net>

ssh/mempipe_test.go

@@ -76,7 +76,7 @@ func memPipe() (a, b packetConn) {
 	return &t1, &t2
 }
 
-func TestmemPipe(t *testing.T) {
+func TestMemPipe(t *testing.T) {
 	a, b := memPipe()
 	if err := a.writePacket([]byte{42}); err != nil {
 		t.Fatalf("writePacket: %v", err)