Fix attention mask size checking for CLIP (#13535)

src/transformers/models/clip/modeling_clip.py

@@ -229,7 +229,7 @@ class CLIPAttention(nn.Module):
         if attention_mask is not None:
             if attention_mask.size() != (bsz, 1, tgt_len, src_len):
                 raise ValueError(
-                    f"Attention mask should be of size {(bsz, 1, tgt_len, src_len)}, but is {causal_attention_mask.size()}"
+                    f"Attention mask should be of size {(bsz, 1, tgt_len, src_len)}, but is {attention_mask.size()}"
                 )
             attn_weights = attn_weights.view(bsz, self.num_heads, tgt_len, src_len) + attention_mask
             attn_weights = attn_weights.view(bsz * self.num_heads, tgt_len, src_len)