make alloca call type correct

From-SVN: r123374

libcpp/ChangeLog

+2007-03-30  Michael Meissner  <michael.meissner@amd.com>
+
+	* directives.c (lex_macro_node_from_str): Fix alloca call to be
+	type correct.
+
 2007-03-30  Richard Henderson  <rth@redhat.com>
 
 	* directives.c (lex_macro_node_from_str): New.

libcpp/directives.c

@@ -2083,7 +2083,7 @@ static cpp_hashnode *
 lex_macro_node_from_str (cpp_reader *pfile, const char *str)
 {
   size_t len = strlen (str);
-  uchar *buf = (char *) alloca (len + 1);
+  uchar *buf = (uchar *) alloca (len + 1);
   cpp_hashnode *node;
 
   memcpy (buf, str, len);