[Build] Fix for the Wswitch-bool clang warning (#10060)

Signed-off-by: Gregory Shtrasberg <Gregory.Shtrasberg@amd.com>

csrc/attention/paged_attention_v1.cu

@@ -140,13 +140,10 @@ void paged_attention_v1_launcher(
       blocksparse_block_size, blocksparse_head_sliding_step);
 
 #define CALL_V1_LAUNCHER_SPARSITY(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE) \
-  switch (is_block_sparse) {                                               \
-    case true:                                                             \
+  if (is_block_sparse) {                                                   \
     CALL_V1_LAUNCHER(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE, true);       \
-      break;                                                               \
-    case false:                                                            \
+  } else {                                                                 \
     CALL_V1_LAUNCHER(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE, false);      \
-      break;                                                               \
   }
 
 // NOTE(woosuk): To reduce the compilation time, we omitted block sizes

csrc/attention/paged_attention_v2.cu

@@ -147,13 +147,10 @@ void paged_attention_v2_launcher(
       blocksparse_head_sliding_step);
 
 #define CALL_V2_LAUNCHER_SPARSITY(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE) \
-  switch (is_block_sparse) {                                               \
-    case true:                                                             \
+  if (is_block_sparse) {                                                   \
     CALL_V2_LAUNCHER(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE, true);       \
-      break;                                                               \
-    case false:                                                            \
+  } else {                                                                 \
     CALL_V2_LAUNCHER(T, CACHE_T, BLOCK_SIZE, IS_FP8_KV_CACHE, false);      \
-      break;                                                               \
   }
 
 // NOTE(woosuk): To reduce the compilation time, we omitted block sizes