UCS/BITMAP/TEST: Fix build with >= Clang 21

First caught on Gentoo LLVM with Clang 21.1.5 and LLVM 21.1.5
Build with fail with the following error message

core/ucp_context.c:2673:47: error: default initialization of an object of type
      'typeof (*tl_bitmap_super)' (aka 'const ucp_tl_bitmap_t') leaves the object uninitialized
      [-Werror,-Wdefault-const-init-var-unsafe]
/var/tmp/portage/sys-cluster/ucx-1.19.0/work/ucx-1.19.0/src/ucs/datastruct/static_bitmap.h:250:5: note:
      expanded from macro 'UCS_STATIC_BITMAP_NOT'
  250 |     UCS_STATIC_BITMAP_UNARY_OP(_bitmap, not, UCS_PP_UNIQUE_ID)
      |     ^
/var/tmp/portage/sys-cluster/ucx-1.19.0/work/ucx-1.19.0/src/ucs/datastruct/static_bitmap.h:239:5: note:
      expanded from macro 'UCS_STATIC_BITMAP_UNARY_OP'
  239 |     _UCS_STATIC_BITMAP_UNARY_OP(_bitmap, _op_name, _uid)
      |     ^
/var/tmp/portage/sys-cluster/ucx-1.19.0/work/ucx-1.19.0/src/ucs/datastruct/static_bitmap.h:232:29: note:
      expanded from macro '_UCS_STATIC_BITMAP_UNARY_OP'
  232 |         ucs_typeof(_bitmap) _r_##_uid; \
      |                             ^
<scratch space>:54:1: note: expanded from here
   54 | _r_0
      | ^
core/ucp_context.c:2672:25: error: default initialization of an object of type
      'typeof (*tl_bitmap)' (aka 'const ucp_tl_bitmap_t') leaves the object uninitialized
      [-Werror,-Wdefault-const-init-var-unsafe]
 2672 |     ucp_tl_bitmap_t b = UCS_STATIC_BITMAP_AND(*tl_bitmap,
      |                         ^

The cause is probably Clang now being more strict and ucs_typeof(_bitmap) _r_##_uid being declared and not used.

Signed-off-by: Brahmajit Das <[email protected]>

Author: listout

src/ucs/datastruct/static_bitmap.h

@@ -229,7 +229,7 @@ BEGIN_C_DECLS
 #define _UCS_STATIC_BITMAP_UNARY_OP(_bitmap, _op_name, _uid) \
     ({ \
         ucs_typeof(_bitmap) _b_##_uid = (_bitmap); \
-        ucs_typeof(_bitmap) _r_##_uid; \
+        ucs_typeof(_bitmap) _r_##_uid = {0}; \
         \
         ucs_bitmap_bits_##_op_name(UCS_STATIC_BITMAP_BITS_ARGS(&_r_##_uid), \
                                    UCS_STATIC_BITMAP_BITS_CARGS(&_b_##_uid)); \
@@ -255,7 +255,7 @@ BEGIN_C_DECLS
     ({ \
         ucs_typeof(_bitmap1) _b1_##_uid = (_bitmap1); \
         ucs_typeof(_bitmap2) _b2_##_uid = (_bitmap2); \
-        ucs_typeof(_bitmap1) _r_##_uid; \
+        ucs_typeof(_bitmap1) _r_##_uid = {0}; \
         \
         ucs_bitmap_bits_binary_op(UCS_STATIC_BITMAP_BITS_ARGS(&_r_##_uid), \
                                   UCS_STATIC_BITMAP_BITS_CARGS(&_b1_##_uid), \