forgot the v

Author: tgrogers

gpu-simulator/setup_environment.sh

@@ -37,9 +37,9 @@ fi
 
 if [ ! -d "$ACCELSIM_ROOT/gpgpu-sim" ] ; then
     git clone https://github.com/gpgpu-sim/gpgpu-sim_distribution.git  $ACCELSIM_ROOT/gpgpu-sim
-    git -C $ACCELSIM_ROOT/gpgpu-sim/ checkout 4.0.1
+    git -C $ACCELSIM_ROOT/gpgpu-sim/ checkout v4.0.1
 else
-    git -C $ACCELSIM_ROOT/gpgpu-sim/ checkout 4.0.1
+    git -C $ACCELSIM_ROOT/gpgpu-sim/ checkout v4.0.1
     git -C $ACCELSIM_ROOT/gpgpu-sim/ pull
 fi