libsepol/cil: drop unused function cil_tree_error

It seems to be unused since its initial addition in 76ba6eaa
("Squashed 'libsepol/cil/' changes from 08520e9..28ad56e").

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

libsepol/cil/src/cil_tree.c

@@ -41,15 +41,6 @@
 #include "cil_parser.h"
 #include "cil_strpool.h"
 
-__attribute__((noreturn)) __attribute__((format (printf, 1, 2))) void cil_tree_error(const char* msg, ...)
-{
-	va_list ap;
-	va_start(ap, msg);
-	cil_vlog(CIL_ERR, msg, ap);
-	va_end(ap);
-	exit(1);
-}
-
 struct cil_tree_node *cil_tree_get_next_path(struct cil_tree_node *node, char **info_kind, uint32_t *hll_line, char **path)
 {
 	int rc;