Only close html tags if they were opened before

The runtime html table is printed only if printing
a verbatim diveplan is disabled. So the closing tags
should be printed only in that case.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

subsurface-core/planner.c

@@ -776,7 +776,8 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool
 		lastsetpoint = dp->setpoint;
 		lastentered = dp->entered;
 	} while ((dp = nextdp) != NULL);
-	len += snprintf(buffer + len, sz_buffer - len, "</tbody></table></div>");
+	if (!plan_verbatim)
+		len += snprintf(buffer + len, sz_buffer - len, "</tbody></table></div>");
 
 	dive->cns = 0;
 	dive->maxcns = 0;