Remove length modifier when using assignment suppression in TimerTest

[aadsm]

Summary

This is useless and it's giving warnings in the build bots:
/home/motus/netbsd8/netbsd8/llvm/tools/lldb/unittests/Utility/TimerTest.cpp:67:43: warning: use of assignment suppression and length modifier together in gnu_scanf format [-Wformat=]

[xiaobai]

lgtm

lldb/unittests/Utility/TimerTest.cpp

Timer::ResetCategoryTimes();
     static Timer::Category tcat2("CAT2");
     Timer t2(tcat2, ".");
     std::this_thread::sleep_for(std::chrono::milliseconds(10));
   }
   StreamString ss;
   Timer::DumpCategoryTimes(&ss);
   double seconds1, seconds2;
   ASSERT_EQ(2, sscanf(ss.GetData(),
-                      "%lf sec (total: %*lfs; child: %*lfs; count: %*d) for "
+                      "%lf sec (total: %*fs; child: %*fs; count: %*d) for "
                       "CAT1%*[\n ]%lf sec for CAT2",
                       &seconds1, &seconds2))
       << "String: " << ss.GetData();
   EXPECT_LT(0.01, seconds1);
   EXPECT_GT(1, seconds1);
   EXPECT_LT(0.001, seconds2);
   EXPECT_GT(0.1, seconds2);
 }
TEST(TimerTest, CategoryTimesStats) {
   // 0.026772798 sec (total: 0.027s; child: 0.000s; count: 2) for CAT2
   StreamString ss;
   Timer::DumpCategoryTimes(&ss);
   double seconds1, total1, child1, seconds2;
   int count1, count2;
   ASSERT_EQ(
       6, sscanf(ss.GetData(),
                 "%lf sec (total: %lfs; child: %lfs; count: %d) for CAT1%*[\n ]"
-                "%lf sec (total: %*lfs; child: %*lfs; count: %d) for CAT2",
+                "%lf sec (total: %*fs; child: %*fs; count: %d) for CAT2",
                 &seconds1, &total1, &child1, &count1, &seconds2, &count2))
       << "String: " << ss.GetData();
   EXPECT_NEAR(total1 - child1, seconds1, 0.002);
   EXPECT_EQ(1, count1);
   EXPECT_NEAR(child1, seconds2, 0.002);
   EXPECT_EQ(2, count2);
 }