ceph plugin: fix a few format specifiers

ceph plugin: fix a few format specifiers

  CC       src/ceph_la-ceph.lo
In file included from ./src/daemon/common.h:33,
                 from src/ceph.c:31:
src/ceph.c: In function ‘cconn_handle_event’:
src/ceph.c:1161:11: warning: format ‘%d’ expects argument of type ‘int’, but argument 6 has type ‘ssize_t’ {aka ‘long int’} [-Wformat=]
     DEBUG("ceph plugin: cconn_handle_event(name=%s,state=%d,amt=%d,ret=%d)",
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           io->d->name, io->state, io->amt, ret);
                                            ~~~
./src/daemon/plugin.h:396:42: note: in definition of macro ‘DEBUG’
 #define DEBUG(...) plugin_log(LOG_DEBUG, __VA_ARGS__)
                                          ^~~~~~~~~~~
src/ceph.c:1183:11: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘ssize_t’ {aka ‘long int’} [-Wformat=]
     DEBUG("ceph plugin: cconn_handle_event(name=%s,state=%d,ret=%d)",
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           io->d->name, io->state, ret);
                                   ~~~
./src/daemon/plugin.h:396:42: note: in definition of macro ‘DEBUG’
 #define DEBUG(...) plugin_log(LOG_DEBUG, __VA_ARGS__)
                                          ^~~~~~~~~~~
src/ceph.c:1209:11: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘ssize_t’ {aka ‘long int’} [-Wformat=]
     DEBUG("ceph plugin: cconn_handle_event(name=%s,state=%d,ret=%d)",
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           io->d->name, io->state, ret);
                                   ~~~
./src/daemon/plugin.h:396:42: note: in definition of macro ‘DEBUG’
 #define DEBUG(...) plugin_log(LOG_DEBUG, __VA_ARGS__)
                                          ^~~~~~~~~~~
src/ceph.c:1230:11: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘ssize_t’ {aka ‘long int’} [-Wformat=]
     DEBUG("ceph plugin: cconn_handle_event(name=%s,state=%d,ret=%d)",
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           io->d->name, io->state, ret);
                                   ~~~
./src/daemon/plugin.h:396:42: note: in definition of macro ‘DEBUG’
 #define DEBUG(...) plugin_log(LOG_DEBUG, __VA_ARGS__)
                                          ^~~~~~~~~~~