Fix segfault in world map export

Attempting to export to write-protected file/directory results in NULL
file reference and leads to segfault when writing/closing it.

Signed-off-by: Sergey Starosek <sergey.starosek@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/worldmap-save.c b/worldmap-save.c
index dfce3627a..0992b8eb5 100644
--- a/worldmap-save.c
+++ b/worldmap-save.c
@@ -102,10 +102,11 @@ void export_worldmap_HTML(const char *file_name, const bool selected_only)
 	export(&buf, selected_only);
 
 	f = subsurface_fopen(file_name, "w+");
-	if (!f)
+	if (!f) {
 		report_error(translate("gettextFromC", "Can't open file %s"), file_name);
-
-	flush_buffer(&buf, f); /*check for writing errors? */
+	} else {
+		flush_buffer(&buf, f); /*check for writing errors? */
+		fclose(f);
+	}
 	free_buffer(&buf);
-	fclose(f);
 }