!7253 fix vgg16 eval shell script bug

Merge pull request !7253 from caojian05/ms_master_bugfix

model_zoo/official/cv/vgg16/scripts/run_eval.sh

@@ -20,7 +20,7 @@ echo "bash run_eval.sh DATA_PATH DATASET_TYPE DEVICE_TYPE CHECKPOINT_PATH"
 echo "for example: bash run_eval.sh /path/ImageNet2012/train cifar10 Ascend /path/a.ckpt "
 echo "=============================================================================================================="
 
-DATA_PATH=&1
+DATA_PATH=$1
 DATASET_TYPE=$2
 DEVICE_TYPE=$3
 CHECKPOINT_PATH=$4
@@ -29,4 +29,4 @@ python eval.py \
     --data_path=$DATA_PATH \
     --dataset=$DATASET_TYPE \
     --device_target=$DEVICE_TYPE \
-    --pre_trained=$CHECKPOINT_PATH > output.eval.log 2>&1 &
+    --pre_trained=$CHECKPOINT_PATH > output.eval.log 2>&1 &