garmin_txt: Fix abort on unknown columns.

diff --git a/garmin_txt.c b/garmin_txt.c
index 97f7716c91a8d19b4ebbb7960fd2612bf9722a78..0065130de39b7d41b28787d25f7a4b94350ff82a 100644 (file)
--- a/garmin_txt.c
+++ b/garmin_txt.c
@@ -1051,7 +1051,7 @@ bind_fields(const header_type ht)
                
                c = fields;
                field_no = 1;
-               while (c != NULL) {
+               while (*c) {
                        if (strcmp(c, name) == 0) {
                                header_fields[ht][i] = field_no;
 #if 0