[PUSHED] gdb/tui: compare pointer to nullptr, not 0

[Andrew Burgess]

Compare pointers to nullptr, not 0.  I also fixed a trailing
whitespace in the same function.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* tui/tui.c (tui_is_window_visible): Compare to nullptr, not 0.
---
 gdb/ChangeLog | 4 ++++
 gdb/tui/tui.c | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/gdb/tui/tui.c b/gdb/tui/tui.c
index 3a2229db16c..ce8dab3c642 100644
--- a/gdb/tui/tui.c
+++ b/gdb/tui/tui.c
@@ -544,9 +544,9 @@ tui_is_window_visible (enum tui_win_type type)
   if (!tui_active)
     return false;
 
-  if (tui_win_list[type] == 0)
+  if (tui_win_list[type] == nullptr)
     return false;
-  
+
   return tui_win_list[type]->is_visible ();
 }
 
-- 
2.25.4