rsz: Fixed a typo in rebuffer1_hier.tcl.

Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>

Author: jhkim-pii

src/rsz/test/rebuffer1_hier.tcl

@@ -35,7 +35,7 @@ diff_file ${verilog_filename}ok $rebuffered_verilog_filename
 set def_filename "rebuffer1_hier_out.def"
 set rebuffered_def_filename [make_result_file $def_filename]
 write_def $rebuffered_def_filename
-diff_file $def_filename}ok $rebuffered_def_filename
+diff_file ${def_filename}ok $rebuffered_def_filename
 
 # TODO: there is an issue that the name name (\u_mid1/l2_out1) of
 #       the new buffer input u_mid1/u_leaf2/rebuffer1/A is wrong