kallsyms: use kmalloc_array() instead of kmalloc()

Replace kmalloc(sizeof(*stat) * 2, GFP_KERNEL) with kmalloc_array(2,
sizeof(*stat), GFP_KERNEL) to prevent potential overflow, as recommended
in Documentation/process/deprecated.rst.

Link: https://lkml.kernel.org/r/20250926075053.25615-1-chandna.linuxkernel@gmail.com


Signed-off-by: Sahil Chandna <chandna.linuxkernel@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: David Hunter <david.hunter.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>