Silence unused variable warning in release builds

lldb/source/Core/DataFileCache.cpp:278:10: warning: unused variable 'pos' [-Wunused-variable]
    auto pos = m_string_to_offset.find(s);
         ^
lldb/source/Core/DataFileCache.cpp:277:18: warning: unused variable 'stroff' [-Wunused-variable]
    const size_t stroff = encoder.GetByteSize() - strtab_offset;
                 ^

1 files changed, 2 insertions, 3 deletions

diff --git a/lldb/source/Core/DataFileCache.cpp b/lldb/source/Core/DataFileCache.cpp
index 8d4dba3..3f52b92 100644
--- a/lldb/source/Core/DataFileCache.cpp
+++ b/lldb/source/Core/DataFileCache.cpp
@@ -274,9 +274,8 @@ bool ConstStringTable::Encode(DataEncoder &encoder) {
   encoder.AppendU8(0); // Start the string table with with an empty string.
   for (auto s: m_strings) {
     // Make sure all of the offsets match up with what we handed out!
-    const size_t stroff = encoder.GetByteSize() - strtab_offset;
-    auto pos = m_string_to_offset.find(s);
-    assert(pos->second == stroff);
+    assert(m_string_to_offset.find(s)->second ==
+           encoder.GetByteSize() - strtab_offset);
     // Append the C string into the encoder
     encoder.AppendCString(s.GetStringRef());
   }