find: Return normal exit status from -quit.

If there was an error, make the exit status reflect this even if -quit
caused the exit. Formerly, -quit always caused exit(0).

GNU find does the same.

usr.bin/find/find.1

@@ -31,7 +31,7 @@
 .\"	@(#)find.1	8.7 (Berkeley) 5/9/95
 .\" $FreeBSD$
 .\"
-.Dd April 12, 2014
+.Dd April 13, 2014
 .Dt FIND 1
 .Os
 .Sh NAME
@@ -778,7 +778,7 @@ option was specified.
 .It Ic -quit
 Causes
 .Nm
-to immediately terminate successfully.
+to terminate immediately.
 .It Ic -regex Ar pattern
 True if the whole path of the file matches
 .Ar pattern

usr.bin/find/function.c

@@ -1781,7 +1781,7 @@ int
 f_quit(PLAN *plan __unused, FTSENT *entry __unused)
 {
 	finish_execplus();
-	exit(0);
+	exit(exitstatus);
 }
 
 /* c_quit == c_simple */