settings: Use thread-safe dirname(3)

src/libstrongswan/utils/settings.c

@@ -20,7 +20,6 @@
 #include <stdio.h>
 #include <errno.h>
 #include <limits.h>
-#include <libgen.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -1302,15 +1301,14 @@ static bool parse_files(linked_list_t *contents, char *file, int level,
 	}
 	else
 	{	/* base relative paths to the directory of the current file */
-		char *path = strdup(file);
-		char *dir = dirname(path);
+		char *dir = path_dirname(file);
 		if (snprintf(pat, sizeof(pat), "%s/%s", dir, pattern) >= sizeof(pat))
 		{
 			DBG1(DBG_LIB, "include pattern too long, ignored");
-			free(path);
+			free(dir);
 			return TRUE;
 		}
-		free(path);
+		free(dir);
 	}
 #ifdef HAVE_GLOB_H
 	{