Fix all memory leaks in test suite

tests/tst-pam_lastlog2-output.c

@@ -108,5 +108,12 @@ main(void)
       return 1;
     }
 
+  if (output)
+    free (output);
+  if (tty)
+    free (tty);
+  if (rhost)
+    free (rhost);
+
   return 0;
 }

tests/tst-remove-entry.c

@@ -81,5 +81,12 @@ main(void)
       return 1;
     }
 
+  if (error)
+    free (error);
+  if (tty)
+    free (tty);
+  if (rhost)
+    free (rhost);
+
   return 0;
 }

tests/tst-rename-user.c

@@ -82,6 +82,12 @@ main(void)
       return 1;
     }
 
+  if (error)
+    {
+      free (error);
+      error = NULL;
+    }
+
   if (ll2_read_entry (db_path, newname, &ll_time, &tty, &rhost, &error) != 0)
     {
       if (error)
@@ -99,5 +105,10 @@ main(void)
       fprintf (stderr, "New entry data does not match old entry data!\n");
     }
 
+  if (tty)
+    free (tty);
+  if (rhost)
+    free (rhost);
+
   return 0;
 }

tests/tst-write-read-user.c

@@ -93,6 +93,12 @@ test_args (const char *db_path, const char *user, int64_t ll_time,
       return 1;
     }
 
+  if (res_tty)
+    free (res_tty);
+
+  if (res_rhost)
+    free (res_rhost);
+
   return 0;
 }