Fix "default argument for lambda parameter" (-Wpedantic) warning

llvm-svn: 350089
diff --git a/lldb/source/Plugins/Process/minidump/ProcessMinidump.cpp b/lldb/source/Plugins/Process/minidump/ProcessMinidump.cpp
index e210e28..7c03081 100644
--- a/lldb/source/Plugins/Process/minidump/ProcessMinidump.cpp
+++ b/lldb/source/Plugins/Process/minidump/ProcessMinidump.cpp
@@ -579,7 +579,7 @@
       s.Printf("\n");
     }
     auto DumpTextStream = [&](MinidumpStreamType stream_type,
-        llvm::StringRef label = llvm::StringRef()) -> void {
+                              llvm::StringRef label) -> void {
       auto bytes = minidump.GetStream(stream_type);
       if (!bytes.empty()) {
         if (label.empty())
@@ -588,7 +588,7 @@
       }
     };
     auto DumpBinaryStream = [&](MinidumpStreamType stream_type,
-        llvm::StringRef label = llvm::StringRef()) -> void {
+                                llvm::StringRef label) -> void {
       auto bytes = minidump.GetStream(stream_type);
       if (!bytes.empty()) {
         if (label.empty())