[MPS] call contiguous after permute (huggingface#1411)

* call contiguous after permute

Fixes for MPS device

* Fix MPS UserWarning

* make style

* Revert "Fix MPS UserWarning"

This reverts commit b46c328.

Author: kashif

src/diffusers/models/attention.py

@@ -221,11 +221,15 @@ def forward(self, hidden_states, encoder_hidden_states=None, timestep=None, retu
         # 3. Output
         if self.is_input_continuous:
             if not self.use_linear_projection:
-                hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
+                hidden_states = (
+                    hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2).contiguous()
+                )
                 hidden_states = self.proj_out(hidden_states)
             else:
                 hidden_states = self.proj_out(hidden_states)
-                hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
+                hidden_states = (
+                    hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2).contiguous()
+                )
 
             output = hidden_states + residual
         elif self.is_input_vectorized: