[NFC][scudo] Small test cleanup

[vitalybuka]

Summary

Fixing issues raised on D102979 review.

[cryptoad]

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

19

nit: probably just if (SCUDO_LINUX) to avoid the #ifdef

[vitalybuka]

#if -> if

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

-//===-- common_test.cpp ---------------------------------------*- C++ -*-===//
+//===-- common_test.cpp -----------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "internal_defs.h"
 #include "tests/scudo_unit_test.h"
 
 #include "common.h"
 #include <algorithm>
 #include <fstream>
 
 namespace scudo {
 
 static uptr getResidentMemorySize() {
+#if !SCUDO_LINUX
+  UNREACHABLE("Not implemented!");
+#endif
   uptr Size;
   uptr Resident;
   std::ifstream IFS("/proc/self/statm");
   IFS >> Size;
   IFS >> Resident;
   return Resident * getPageSizeCached();
 }
 
 // Fuchsia needs getResidentMemorySize implementation.
 TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) {
   uptr OnStart = getResidentMemorySize();
   EXPECT_GT(OnStart, 0);
 
   const uptr Size = 1ull << 30;
   const uptr Threshold = Size >> 3;
 
-  MapPlatformData Data;
+  MapPlatformData Data = {};
   uptr *P = reinterpret_cast<uptr *>(
       map(nullptr, Size, "ResidentMemorySize", 0, &Data));
   const uptr N = Size / sizeof(*P);
   ASSERT_NE(nullptr, P);
   EXPECT_EQ(std::count(P, P + N, 0), N);
   EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
 
   memset(P, 1, Size);
   EXPECT_EQ(std::count(P, P + N, 0), 0);
   EXPECT_LT(getResidentMemorySize() - 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) << OnStart << " "
-  // <<  getResidentMemorySize();
+  // EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
 
   memset(P, 1, Size);
   EXPECT_EQ(std::count(P, P + N, 0), 0);
   EXPECT_LT(getResidentMemorySize() - Size, Threshold);
 }
 
 } // namespace scudo
 No newline at end of file