BUG/MINOR: log: Add OOM checks for calloc() and malloc() in logformat parser and...

BUG/MINOR: log: Add OOM checks for calloc() and malloc() in logformat parser and dup_logger()

This patch adds missing out-of-memory (OOM) checks after calls
to `calloc()` and `malloc()` in the logformat parser and the
`dup_logger()` function. If memory allocation fails, an error
is reported or NULL is returned, preventing undefined behavior
in low-memory conditions.

Co-authored-by: Christian Norbert Menges <christian.norbert.menges@sap.com>
(cherry picked from commit 22ac1f5ee9889eb7273201de0d92449d9fc5e3fa)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 0fd91432f06ee6a7b427664be127b02c854e34ab)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit de370ed1e1925fa54778ae021f92c97f96ca1a03)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>