Fix some signedness issues

I always worry if these are worth following up on - but these seem pretty
clear and obvious to me. As far as the planner is concerned, depth is
unsigned.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/dive.h b/dive.h
index 98cae9c38..d466643d2 100644
--- a/dive.h
+++ b/dive.h
@@ -692,7 +692,7 @@ extern double restore_deco_state(char *data);
 
 struct divedatapoint {
 	int time;
-	int depth;
+	unsigned int depth;
 	int o2;
 	int he;
 	int po2;