[llvm-objcopy] [COFF] Clear the unwritten tail of coff_section::Header::Name

This should fix the add-gnu-debuglink test on all buildbots.

llvm-svn: 351934

tools/llvm-objcopy/COFF/Writer.cpp

@@ -121,6 +121,7 @@ size_t COFFWriter::finalizeStringTable() {
 
   for (auto &S : Obj.getMutableSections()) {
     if (S.Name.size() > COFF::NameSize) {
+      memset(S.Header.Name, 0, sizeof(S.Header.Name));
       snprintf(S.Header.Name, sizeof(S.Header.Name), "/%d",
                (int)StrTabBuilder.getOffset(S.Name));
     } else {