scsi: lpfc: Print rx monitor records straight into the seq_buf

lpfc_rx_monitor_report() formats each record into a stack buffer, then
appends it with seq_buf_puts(), relying on seq_buf_puts() appending
nothing when a string does not fit: the debugfs output then ends at the
last whole record, and the record left out is read in full next time.
The next patch makes seq_buf_puts() copy as much as fits instead, as
seq_buf_printf() and strlcat() do.

Print each record with seq_buf_printf(), and when it does not fit, end
the string where the record began, since the reader takes the buffer up
to its NUL. This also takes the DBG_LOG_STR_SZ buffer off the stack.

Build tested ARCH=x86_64 with GCC 16.2.0, CONFIG_SCSI_LPFC=m and W=1.

Assisted-by: LLM
Link: https://patch.msgid.link/20261005155708.1471260-3-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

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