Remove unused variables and fix signed/unsigned mismatch

The depth types are unsigned for dive plan datapoints.

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

planner.c

@@ -119,7 +119,7 @@ double tissue_at_end(struct dive *dive, char **cached_datap)
 {
 	struct divecomputer *dc;
 	struct sample *sample, *psample;
-	int i, j, t0, t1, gasidx, lastdepth;
+	int i, t0, t1, gasidx, lastdepth;
 	int o2, he;
 	double tissue_tolerance;
 
@@ -582,11 +582,11 @@ void plan(struct diveplan *diveplan, char **cached_datap, struct dive **divep, b
 {
 	struct dive *dive;
 	struct sample *sample;
-	int wait_time, o2, he, po2;
+	int o2, he, po2;
 	int transitiontime, gi;
 	int current_cylinder;
 	unsigned int stopidx;
-	int depth, ceiling;
+	int depth;
 	double tissue_tolerance;
 	struct gaschanges *gaschanges = NULL;
 	int gaschangenr;

qt-ui/diveplanner.cpp

@@ -520,9 +520,7 @@ void DivePlannerGraphics::drawProfile()
 			computedPoints.push_back(i);
 	plannerModel->removeSelectedPoints(computedPoints);
 
-	int lastdepth = 0;
-	int lasto2 = 0;
-	int lasthe = 0;
+	unsigned int lastdepth = 0;
 	for (dp = diveplan.dp; dp != NULL; dp = dp->next) {
 		if (dp->time == 0) // magic entry for available tank
 			continue;
@@ -538,8 +536,6 @@ void DivePlannerGraphics::drawProfile()
 				if (dp->depth == lastdepth || dp->o2 != dp->next->o2 || dp->he != dp->next->he)
 					plannerModel->addStop(dp->depth, dp->time, dp->o2, dp->he, 0, false);
 				lastdepth = dp->depth;
-				lasto2 = dp->o2;
-				lasthe = dp->he;
 			}
 		}
 		lastx = xpos;