Change tui_source_element::line to be a unique_xmalloc_ptr

This changes tui_source_element::line to be a unique_xmalloc_ptr,
removing some manual memory management.

gdb/ChangeLog
2019-09-20  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.h (~tui_source_element): Remove.
	(tui_source_element): Update.
	(struct tui_source_element) <line>: Now a unique_xmalloc_ptr.
	* tui/tui-winsource.c (tui_show_source_line): Update.
	* tui/tui-source.c (tui_source_window::set_contents): Update.
	* tui/tui-disasm.c (tui_disasm_window::set_contents): Update.

1 files changed, 2 insertions, 8 deletions

diff --git a/gdb/tui/tui-winsource.h b/gdb/tui/tui-winsource.h
index 445cc7c..64f0739 100644
--- a/gdb/tui/tui-winsource.h
+++ b/gdb/tui/tui-winsource.h
@@ -54,23 +54,17 @@ struct tui_source_element
     line_or_addr.u.line_no = 0;
   }
 
-  ~tui_source_element ()
-  {
-    xfree (line);
-  }
-
   DISABLE_COPY_AND_ASSIGN (tui_source_element);
 
   tui_source_element (tui_source_element &&other)
-    : line (other.line),
+    : line (std::move (other.line)),
       line_or_addr (other.line_or_addr),
       is_exec_point (other.is_exec_point),
       break_mode (other.break_mode)
   {
-    other.line = nullptr;
   }
 
-  char *line = nullptr;
+  gdb::unique_xmalloc_ptr<char> line;
   struct tui_line_or_address line_or_addr;
   bool is_exec_point = false;
   tui_bp_flags break_mode = 0;