Fix Resnet (#7805)

Fixes #7802.


### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: YunLiu <[email protected]>

monai/networks/nets/resnet.py

@@ -94,13 +94,12 @@ def __init__(
         super().__init__()
 
         conv_type: Callable = Conv[Conv.CONV, spatial_dims]
-        norm_layer = get_norm_layer(name=norm, spatial_dims=spatial_dims, channels=planes)
 
         self.conv1 = conv_type(in_planes, planes, kernel_size=3, padding=1, stride=stride, bias=False)
-        self.bn1 = norm_layer
+        self.bn1 = get_norm_layer(name=norm, spatial_dims=spatial_dims, channels=planes)
         self.act = get_act_layer(name=act)
         self.conv2 = conv_type(planes, planes, kernel_size=3, padding=1, bias=False)
-        self.bn2 = norm_layer
+        self.bn2 = get_norm_layer(name=norm, spatial_dims=spatial_dims, channels=planes)
         self.downsample = downsample
         self.stride = stride