Fix DyDCNv2 RuntimeError (open-mmlab#8485)

the parameter of offset is not set as continuous will trigger the runtime error: offset must be continuous

mmdet/models/necks/dyhead.py

@@ -44,7 +44,7 @@ def __init__(self,
 
  def forward(self, x, offset, mask):
  """Forward function."""
- x = self.conv(x.contiguous(), offset, mask)
+ x = self.conv(x.contiguous(), offset.contiguous(), mask)
  if self.with_norm:
  x = self.norm(x)
  return x