Fix the following strncpy() string truncation warning:

In function ‘strncpy’,
    inlined from ‘parse_cgroup_spec’ at ../tools/tools-common.c:92:2:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: warning: 
‘__builtin_strncpy’ specified bound 4096 equals destination size 
[-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Tom Hromatka <tom.hroma...@oracle.com>
---
 src/tools/tools-common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/tools/tools-common.c b/src/tools/tools-common.c
index 211a49a93e6a..4b0efa8b216b 100644
--- a/src/tools/tools-common.c
+++ b/src/tools/tools-common.c
@@ -89,8 +89,8 @@ int parse_cgroup_spec(struct cgroup_group_spec **cdptr, char 
*optarg,
        } while (temp && j<CG_CONTROLLER_MAX-1);
 
        /* Store path to the cgroup */
-       strncpy(cdptr[i]->path, pathptr, FILENAME_MAX);
-       cdptr[i]->path[FILENAME_MAX-1] = '\0';
+       strncpy(cdptr[i]->path, pathptr, FILENAME_MAX - 1);
+       cdptr[i]->path[sizeof(cdptr[i]->path) - 1] = '\0';
 
        return 0;
 }
-- 
2.25.1



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