hw/cxl: Fix a QEMU_BUILD_BUG_ON() in switch statement scope issue.

As _Static_assert is a declaration, it can't follow a label until C23.
Some older versions of GCC trip up on this one.

This check has no obvious purpose so just remove it.

Reported-by: Jeongtae Park <jtp.park@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20231023140210.3089-6-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/cxl/cxl-component-utils.c

@@ -305,7 +305,6 @@ void cxl_component_register_init_common(uint32_t *reg_state,
     ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ARRAY_SIZE, caps);
 
 #define init_cap_reg(reg, id, version)                                        \
-    QEMU_BUILD_BUG_ON(CXL_##reg##_REGISTERS_OFFSET == 0);                     \
     do {                                                                      \
         int which = R_CXL_##reg##_CAPABILITY_HEADER;                          \
         reg_state[which] = FIELD_DP32(reg_state[which],                       \