Simplify init_lread() branch and fix comments

[Chris Gregory <czipperz@gmail.com>]

This patch moves the comments before the branch in init_lread() to the
correct locations, and simplifies the branch because (true && a) == a.
-- 
Chris Gregory

Diff:

diff --git a/src/lread.c b/src/lread.c
index 35348f1..23ebc8f 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -4430,17 +4430,13 @@ load_path_default (void)
 void
 init_lread (void)
 {
-  /* First, set Vload_path.  */
-
-  /* Ignore EMACSLOADPATH when dumping.  */
-#ifdef CANNOT_DUMP
-  bool use_loadpath = true;
-#else
-  bool use_loadpath = NILP (Vpurify_flag);
-#endif
-
-  if (use_loadpath && egetenv ("EMACSLOADPATH"))
+  if (
+#ifndef CANNOT_DUMP
+      NILP (Vpurify_flag) &&
+#endif
+      egetenv ("EMACSLOADPATH"))
     {
+      /* First, set Vload_path.  */
       Vload_path = decode_env_path ("EMACSLOADPATH", 0, 1);
 
       /* Check (non-nil) user-supplied elements.  */
@@ -4479,6 +4475,7 @@ init_lread (void)
     }
   else
     {
+      /* Ignore EMACSLOADPATH when dumping.  */
       Vload_path = load_path_default ();
 
       /* Check before adding site-lisp directories.