[NFC][SCUDO] Fix unittest for -gtest_repeat=10

[vitalybuka]

Restore count after getResidentMemorySize check

compiler-rt/lib/scudo/standalone/tests/common_test.cpp

TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) {
   const uptr Size = 1ull << 30;
   const uptr Threshold = Size >> 3;
 
   MapPlatformData Data = {};
   uptr *P = reinterpret_cast<uptr *>(
       map(nullptr, Size, "ResidentMemorySize", 0, &Data));
   const ptrdiff_t N = Size / sizeof(*P);
   ASSERT_NE(nullptr, P);
-  EXPECT_EQ(std::count(P, P + N, 0), N);
   EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
+  EXPECT_EQ(std::count(P, P + N, 0), N);
 
   memset(P, 1, Size);
   EXPECT_EQ(std::count(P, P + N, 0), 0);
-  EXPECT_LT(getResidentMemorySize() - Size, Threshold);
+  EXPECT_GT(getResidentMemorySize() - OnStart, Size - Threshold);
 
   releasePagesToOS((uptr)P, 0, Size, &Data);
   EXPECT_EQ(std::count(P, P + N, 0), N);
   // FIXME: does not work with QEMU-user.
   // EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
 
   memset(P, 1, Size);
   EXPECT_EQ(std::count(P, P + N, 0), 0);
-  EXPECT_LT(getResidentMemorySize() - Size, Threshold);
+  EXPECT_GT(getResidentMemorySize() - OnStart, Size - Threshold);
+
+  unmap(P, Size, 0, &Data);
 }
 
 } // namespace scudo