Initialize / reset selected_dive to -1

The value of 0 that we used is actually a valid value and could cause
confusion.

Suggested-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

3 files changed, 3 insertions, 3 deletions

diff --git a/divelist-gtk.c b/divelist-gtk.c
index e7194d87e..3f96193c5 100644
--- a/divelist-gtk.c
+++ b/divelist-gtk.c
@@ -1319,7 +1319,7 @@ static void delete_selected_dives_cb(GtkWidget *menuitem, GtkTreePath *path)
 
 	/* if no dives are selected at this point clear the display widgets */
 	if (!amount_selected) {
-		selected_dive = 0;
+		selected_dive = -1;
 		process_selected_dives();
 		clear_stats_widgets();
 		clear_equipment_widgets();
diff --git a/gtk-gui.c b/gtk-gui.c
index 2797b8fa6..b8d749858 100644
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -268,7 +268,7 @@ static void file_close(GtkWidget *w, gpointer data)
 	mark_divelist_changed(FALSE);
 
 	/* clear the selection and the statistics */
-	selected_dive = 0;
+	selected_dive = -1;
 	process_selected_dives();
 	clear_stats_widgets();
 	clear_events();
diff --git a/profile.c b/profile.c
index 18960fcff..e40ee5bad 100644
--- a/profile.c
+++ b/profile.c
@@ -12,7 +12,7 @@
 #include "libdivecomputer/parser.h"
 #include "libdivecomputer/version.h"
 
-int selected_dive = 0;
+int selected_dive = -1; /* careful: 0 is a valid value */
 char zoomed_plot = 0;
 char dc_number = 0;