[bootstrap-O3,fortran] add a NULL initializer to avoid a warning at -O3

Building with the bootstrap-O3 configuration option fails to compile
fortran/module.c due to an AFAICT false-positive warning about an
uninitialized use of a variable.

This patch adds a dummy initializer to silence it.

for  gcc/fortran/ChangeLog

	* module.c (load_omp_udrs): Initialize name.

From-SVN: r244087

gcc/fortran/ChangeLog

+2017-01-04  Alexandre Oliva <aoliva@redhat.com>
+
+	* module.c (load_omp_udrs): Initialize name.
+
 2017-01-02  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	PR fortran/78534

gcc/fortran/module.c

@@ -4702,7 +4702,7 @@ load_omp_udrs (void)
   mio_lparen ();
   while (peek_atom () != ATOM_RPAREN)
     {
-      const char *name, *newname;
+      const char *name = NULL, *newname;
       char *altname;
       gfc_typespec ts;
       gfc_symtree *st;