(difftm): Simplify expression.

src/editfns.c

@@ -611,15 +611,13 @@ and from `file-attributes'.")
 
 /* Yield A - B, measured in seconds.  */
 static long
-difftm(a, b)
+difftm (a, b)
      struct tm *a, *b;
 {
   int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
   int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
-  return
-    (
-     (
-      (
+  /* Some compilers can't handle this as a single return statement.  */
+  int days = (
 	      /* difference in day of year */
 	      a->tm_yday - b->tm_yday
 	      /* + intervening leap days */
@@ -628,9 +626,10 @@ difftm(a, b)
 	      +  ((ay/100 >> 2) - (by/100 >> 2))
 	      /* + difference in years * 365 */
 	      +  (long)(ay-by) * 365
-       )*24 + (a->tm_hour - b->tm_hour)
-      )*60 + (a->tm_min - b->tm_min)
-     )*60 + (a->tm_sec - b->tm_sec);
+	      );
+  return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
+	      + (a->tm_min - b->tm_min))
+	  + (a->tm_sec - b->tm_sec));
 }
 
 DEFUN ("current-time-zone", Fcurrent_time_zone, Scurrent_time_zone, 0, 1, 0,