Free ui::line_buffer

A ui initializes its line_buffer, but never calls buffer_free on it.
This patch fixes the oversight.  I found this by inspection.

1 files changed, 2 insertions, 0 deletions

diff --git a/gdb/top.c b/gdb/top.c
index 07e4914..18a447e 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -352,6 +352,8 @@ ui::~ui ()
   delete m_gdb_stdin;
   delete m_gdb_stdout;
   delete m_gdb_stderr;
+
+  buffer_free (&line_buffer);
 }
 
 /* Open file named NAME for read/write, making sure not to make it the