fix an incorrect free

diff --git a/calc.c b/calc.c
index b2b3fbf689ac21f655dd99657f7ed38480c1a2dd..beae0c1dd098e1dc4ad11c947bb6b0a7d69c9250 100644 (file)
--- a/calc.c
+++ b/calc.c
@@ -211,13 +211,16 @@ int main (int argc, char *argv[])
 
         if (mode) {
             free (buffer);
+            buffer = NULL;
         } else {
             memset (buffer, 0, BUFFER_SIZE);
         }
         fflush (stdout);
     }
 
-    clean_read_line (buffer);
+    if (mode) {
+        clean_read_line (buffer);
+    }
 
     free_format ();