Fix TCL's failure to do short circuit eval properly

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/scripts/detail_route.tcl

@@ -1,9 +1,10 @@
 utl::set_metrics_stage "detailedroute__{}"
 source $::env(SCRIPTS_DIR)/load.tcl
-if {[expr [file exists $::global_route_congestion_report] && \
-    [file size $::global_route_congestion_report] != 0]} {
-  error "Global routing failed, run `make gui_grt` and load $::global_route_congestion_report \
-    in DRC viewer to view congestion"
+if {[file exists $::global_route_congestion_report]} {
+  if {[file size $::global_route_congestion_report] != 0]} {
+    error "Global routing failed, run `make gui_grt` and load $::global_route_congestion_report \
+          in DRC viewer to view congestion"
+  }
 }
 load_design 5_1_grt.odb 4_cts.sdc
 erase_non_stage_variables route