bpf, docs: Fix non-standard line break

Even though the kernel's coding-style document does not explicitly
state this, we generally put a newline after the semicolon of every
C language statement to enhance code readability.

Adjust the placement of newlines to adhere to this convention.

Reported-by: Chen Linxuan <chenlinxuan@uniontech.com>
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Link: https://lore.kernel.org/r/DB66473733449DB0+20250423030632.17626-1-wangyuli@uniontech.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>