[PATCH] dynamic-complete-history: avoid null ptr qsort UB

[Grisha Levit]

$ HISTFILE= bash --norc -in <<< $'#\n#\e\t'
bashline.c:3720:16: runtime error: null pointer passed as argument 1, which is 
declared to never be null
/usr/include/stdlib.h:971:30: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior bashline.c:3720:16
---
 bashline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bashline.c b/bashline.c
index 0a4e280e..1f234122 100644
--- a/bashline.c
+++ b/bashline.c
@@ -3727,7 +3727,7 @@ build_history_completion_array (void)
        }
 
       /* Sort the complete list of tokens. */
-      if (dabbrev_expand_active == 0)
+      if (harry_len && dabbrev_expand_active == 0)
         qsort (history_completion_array, harry_len, sizeof (char *), (QSFUNC 
*)strvec_strcmp);
     }
 }
-- 
2.45.1