use BB_EXECVP_or_die where appropriate

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

init/bootchartd.c

@@ -441,8 +441,7 @@ int bootchartd_main(int argc UNUSED_PARAM, char **argv)
 		pid_t pid = xvfork();
 		if (pid == 0) { /* child */
 			argv += 2;
-			execvp(argv[0], argv);
-			bb_perror_msg_and_die("can't execute '%s'", argv[0]);
+			BB_EXECVP_or_die(argv);
 		}
 		/* parent */
 		waitpid(pid, NULL, 0);