Rename loop variable in `src/eval.c's unwind_to_catch()

[Chris Gregory]

Change last_time to found_catch.  This more clearly expresses the
meaning of the loop, rather than just saying that this variable
controls when it breaks, which is obvious.
-- 
Chris Gregory

diff --git a/src/eval.c b/src/eval.c
index e50e26a..6c24e27 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1121,7 +1121,7 @@ internal_catch (Lisp_Object tag,
 static _Noreturn void
 unwind_to_catch (struct handler *catch, Lisp_Object value)
 {
-  bool last_time;
+  bool found_catch;
 
   eassert (catch->next);
 
@@ -1138,11 +1138,11 @@ unwind_to_catch (struct handler *catch, Lisp_Object 
value)
       /* Unwind the specpdl stack, and then restore the proper set of
         handlers.  */
       unbind_to (handlerlist->pdlcount, Qnil);
-      last_time = handlerlist == catch;
-      if (! last_time)
+      found_catch = handlerlist == catch;
+      if (! found_catch)
        handlerlist = handlerlist->next;
     }
-  while (! last_time);
+  while (! found_catch);
 
   eassert (handlerlist == catch);