libgo patch committed: Return 0, not NULL, for type int

[Ian Lance Taylor]

This patch by Andrew Wilkins fixes libgo to return 0 rather than NULL
from main, which does, after all, return int.  Bootstrapped on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 227665)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-9bac6243d2252b2d043243d6ab1123ba7e90fa53
+352617bfe0a880febf5d2a87e89ea439c742ba18
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/runtime/go-main.c
===================================================================
--- libgo/runtime/go-main.c     (revision 227299)
+++ libgo/runtime/go-main.c     (working copy)
@@ -38,7 +38,7 @@ main (int argc, char **argv)
   runtime_isarchive = false;
 
   if (runtime_isstarted)
-    return NULL;
+    return 0;
   runtime_isstarted = true;
 
   runtime_check ();