(main): Check for trailing ", " before trying to delete it.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib-src/b2m.c b/lib-src/b2m.c
index 416db6385ff..526d173acb6 100644
--- a/lib-src/b2m.c
+++ b/lib-src/b2m.c
@@ -131,7 +131,9 @@ main (argc, argv)
               while (p = strtok (NULL, " ,\r\n\t"))
                 labels = concat (labels, p, ", ");
 
-              labels[strlen (labels) - 2] = '\0';
+              p = &labels[strlen (labels) - 2];
+              if (*p == ',')
+                *p = '\0';
               printing = header = FALSE;
               labels_saved = TRUE;
               continue;