[committed] Fix used but not set warning in dwarf2out.c.

[Richard Henderson]

This showed up on i686-linux with BOOT_CFLAGS='-Os -g'.  I didn't
investigate the full call chain for why the variable wasn't set
in the by-reference call to fortran_common.


r~

        * dwarf2out.c (gen_variable_die): Initialize off.

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 828e996..ca88fc5 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -17765,7 +17765,7 @@ common_block_die_table_eq (const void *x, const void *y)
 static void
 gen_variable_die (tree decl, tree origin, dw_die_ref context_die)
 {
-  HOST_WIDE_INT off;
+  HOST_WIDE_INT off = 0;
   tree com_decl;
   tree decl_or_origin = decl ? decl : origin;
   tree ultimate_origin;