Mapfile parser doesn't error if there's remaining data after the closing END tag

[tbonfort]

MAP
 ...
 LAYER
  ...
 END
END
LAYER
 ...
END

has a closing END tag placed too early, but the mapfile parser does not error. This can be confusing as the second layer doesn't show up in the rendered map

[tbonfort]

patch to throw an error

Index: mapfile.c
===================================================================
--- mapfile.c	(revision 8648)
+++ mapfile.c	(working copy)
@@ -4739,6 +4739,11 @@
       if(map->debug == MS_NUMBER) map->debug = (int) msyynumber;
       break;
     case(END):
+      if(msyylex()!=EOF) {
+    	  msSetError(MS_IDENTERR, "Stray keyword (%s) (line %d) after closing END", "msLoadMap()", 
+    	                   msyytext, msyylineno);
+    	  return MS_FAILURE;
+      }
       if(msyyin) {
           fclose(msyyin);
           msyyin = NULL;