tools: ynl: Specify --no-line-number in ynl-regen.sh.

tools: ynl: Specify --no-line-number in ynl-regen.sh.

If grep.lineNumber is enabled in .gitconfig,

  [grep]
  lineNumber = true

ynl-regen.sh fails with the following error:

  $ ./tools/net/ynl/ynl-regen.sh -f
  ...
  ynl_gen_c.py: error: argument --mode: invalid choice: '4:' (choose from user, kernel, uapi)
  	GEN 4:	net/ipv4/fou_nl.c

Let's specify --no-line-number explicitly.

Fixes: be5bea1cc0bf ("net: add basic C code generators for Netlink")
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260115172533.693652-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>