drakenclimber / libcgroup / 5604182622

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cgsnapshot: Fix compiler truncation warning

Fix the following warning when running `make distcheck`

	../../../../src/tools/cgsnapshot.c: In function ‘is_ctlr_on_list’:
	../../../../src/tools/cgsnapshot.c:532:57: warning: ‘%s’ directive output may be truncated writing up to 409599 bytes into a region of size 4096 [-Wformat-truncation=]
	  532 |                 snprintf(controllers[i], FILENAME_MAX, "%s", tmp_controllers[i]);
	      |                                                         ^~

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

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