tools/cgsnapshot: fix wrong array size in is_ctrl_on_list()

tools/cgsnapshot: fix wrong array size in is_ctrl_on_list()

GCC throws -Wstringop-overflow warning:

  CC       cgsnapshot-cgsnapshot.o
cgsnapshot.c: In function 'parse_controllers':
cgsnapshot.c:540:53: warning: 'is_ctlr_on_list' accessing 16777216 bytes in a region of size 409600 [-Wstringop-overflow=]
  540 |                         if ((!(flags & FL_LIST) || (is_ctlr_on_list(controllers, cont_names))) &&
      |                                                    ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cgsnapshot.c:540:53: note: referencing argument 2 of type 'char(*)[4096]'
cgsnapshot.c:495:12: note: in a call to function 'is_ctlr_on_list'
  495 | static int is_ctlr_on_list(char controllers[CG_CONTROLLER_MAX][FILENAME_MAX],
      |            ^~~~~~~~~~~~~~~
cgsnapshot.c:560:37: warning: 'is_ctlr_on_list' accessing 16777216 bytes in a region of size 409600 [-Wstringop-overflow=]
  560 |         if ((!(flags & FL_LIST) || (is_ctlr_on_list(controllers, cont_names))) &&
      |                                    ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cgsnapshot.c:560:37: note: referencing argument 2 of type 'char(*)[4096]'
cgsnapshot.c:495:12: note: in a call to function 'is_ctlr_on_list'
  495 | static int is_ctlr_on_list(char controllers[CG_CONTROLLER_MAX][FILENAME_MAX],
      |            ^~~~~~~~~~~~~~~

the warning is seen due to the mismatch in the array size of the second
argument passed to is_ctlr_on_list() from parse_controllers().  Fix,
this long standing warning by chaging the size of the second function
argument in is_ctrl_on_list().

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
(cherry picked from commit 4362c8d32d5d8813a9a40bebe744aeaec5fbf953)