[binutils-gdb] Fix error in file_and_directory patch

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=621f8c42d3df079ca5781cdb0925c5ec3498f59c

commit 621f8c42d3df079ca5781cdb0925c5ec3498f59c
Author: Tom Tromey <tromey@adacore.com>
Date:   Wed Dec 8 12:52:34 2021 -0700

    Fix error in file_and_directory patch
    
    In my earlier C++-ization patch for file_and_directory, I introduced
    an error:
    
    -  if (strcmp (fnd.name, "<unknown>") != 0)
    +  if (fnd.is_unknown ())
    
    This change inverted the sense of the test, which causes failures with
    .debug_names.
    
    This patch fixes the bug.  Regression tested on x86-64 Fedora 34.  I
    also tested it using the AdaCore internal test suite, with
    .debug_names -- this was failing before, and now it works.

Diff:
---
 gdb/dwarf2/read.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index f2d7da7de52..dd2134b3c63 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -3008,7 +3008,7 @@ dw2_get_file_names_reader (const struct die_reader_specs *reader,
   file_and_directory &fnd = find_file_and_directory (comp_unit_die, cu);
 
   int offset = 0;
-  if (fnd.is_unknown ())
+  if (!fnd.is_unknown ())
     ++offset;
   else if (lh == nullptr)
     return;