[BugFix] logger is not callable (vllm-project#16312)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>
Signed-off-by: Yang Wang <elainewy@meta.com>

Author: yihong0618

vllm/attention/backends/hpu_attn.py

@@ -149,8 +149,8 @@ def __init__(
                 self.fused_scaled_dot_product_attention = ModuleFusedSDPA(
                     FusedSDPA)
             except ImportError:
-                logger().warning("Could not import HPU FusedSDPA kernel. "
-                                 "vLLM will use native implementation.")
+                logger.warning("Could not import HPU FusedSDPA kernel. "
+                               "vLLM will use native implementation.")
 
         suppored_head_sizes = HPUPagedAttention.get_supported_head_sizes()
         if head_size not in suppored_head_sizes: