[lldb] Use nullptr instead of NULL (NFC)

Identified with modernize-use-nullptr.

GitOrigin-RevId: 4f8a2194c995acfb4514df39d04c918095f6cd4b
diff --git a/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp b/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
index af34301..f7f0104 100644
--- a/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
+++ b/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
@@ -135,8 +135,8 @@
   const char *GetIgnoredExceptions() const {
     const uint32_t idx = ePropertyIgnoredExceptions;
     const OptionValueString *option_value =
-        m_collection_sp->GetPropertyAtIndexAsOptionValueString(
-            NULL, false, idx);
+        m_collection_sp->GetPropertyAtIndexAsOptionValueString(nullptr, false,
+                                                               idx);
     assert(option_value);
     return option_value->GetCurrentValue();
   }
@@ -144,8 +144,8 @@
   OptionValueString *GetIgnoredExceptionValue() {
     const uint32_t idx = ePropertyIgnoredExceptions;
     OptionValueString *option_value =
-        m_collection_sp->GetPropertyAtIndexAsOptionValueString(
-            NULL, false, idx);
+        m_collection_sp->GetPropertyAtIndexAsOptionValueString(nullptr, false,
+                                                               idx);
     assert(option_value);
     return option_value;
   }