linux: fix broken tests

Fixes errors for comparisons between signed and unsigned ints.

Change-Id: I7ef151ba84a48a0c8cc449cfaf12b9fef775d5a7
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1642361
Reviewed-by: Mark Mentovai <mark@chromium.org>
diff --git a/src/client/linux/handler/exception_handler_unittest.cc b/src/client/linux/handler/exception_handler_unittest.cc
index be49ef0..bcbf9c2 100644
--- a/src/client/linux/handler/exception_handler_unittest.cc
+++ b/src/client/linux/handler/exception_handler_unittest.cc
@@ -887,13 +887,13 @@
 
   uint64_t instruction_pointer;
   ASSERT_TRUE(exception_context->GetInstructionPointer(&instruction_pointer));
-  EXPECT_EQ(instruction_pointer, 0);
+  EXPECT_EQ(instruction_pointer, 0u);
 
   MinidumpMemoryList* memory_list = minidump.GetMemoryList();
   ASSERT_TRUE(memory_list);
 
   unsigned int region_count = memory_list->region_count();
-  ASSERT_GE(region_count, 1);
+  ASSERT_GE(region_count, 1u);
 
   for (unsigned int region_index = 0;
        region_index < region_count;
diff --git a/src/client/linux/minidump_writer/linux_ptrace_dumper_unittest.cc b/src/client/linux/minidump_writer/linux_ptrace_dumper_unittest.cc
index 8757563..a41dafc 100644
--- a/src/client/linux/minidump_writer/linux_ptrace_dumper_unittest.cc
+++ b/src/client/linux/minidump_writer/linux_ptrace_dumper_unittest.cc
@@ -426,7 +426,7 @@
 #undef TestBody
 
 TEST(LinuxPtraceDumperTest, VerifyStackReadWithMultipleThreads) {
-  static const int kNumberOfThreadsInHelperProgram = 5;
+  static const size_t kNumberOfThreadsInHelperProgram = 5;
 
   pid_t child_pid = SetupChildProcess(kNumberOfThreadsInHelperProgram);
   ASSERT_NE(child_pid, -1);
@@ -484,7 +484,7 @@
 }
 
 TEST_F(LinuxPtraceDumperTest, SanitizeStackCopy) {
-  static const int kNumberOfThreadsInHelperProgram = 1;
+  static const size_t kNumberOfThreadsInHelperProgram = 1;
 
   pid_t child_pid = SetupChildProcess(kNumberOfThreadsInHelperProgram);
   ASSERT_NE(child_pid, -1);