x86/insn: Add @buf_len param to insn_init() kernel-doc comment

It wasn't documented so add it. No functional changes.
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lkml.kernel.org/r/20210304174237.31945-3-bp@alien8.de

arch/x86/lib/insn.c

@@ -51,6 +51,7 @@
  * insn_init() - initialize struct insn
  * @insn:	&struct insn to be initialized
  * @kaddr:	address (in kernel memory) of instruction (or copy thereof)
+ * @buf_len:	length of the insn buffer at @kaddr
  * @x86_64:	!0 for 64-bit kernel or 64-bit app
  */
 void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64)

tools/arch/x86/lib/insn.c

@@ -51,6 +51,7 @@
  * insn_init() - initialize struct insn
  * @insn:	&struct insn to be initialized
  * @kaddr:	address (in kernel memory) of instruction (or copy thereof)
+ * @buf_len:	length of the insn buffer at @kaddr
  * @x86_64:	!0 for 64-bit kernel or 64-bit app
  */
 void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64)