t0050: use the SYMLINKS test prereq

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0050-filesystem.sh

@@ -8,7 +8,6 @@ auml=$(printf '\303\244')
 aumlcdiar=$(printf '\141\314\210')
 
 unibad=
-no_symlinks=
 test_expect_success 'see what we expect' '
 
 	test_unicode=test_expect_success &&
@@ -21,13 +20,7 @@ test_expect_success 'see what we expect' '
 		;;
 	*)	;;
 	esac &&
-	rm -fr junk &&
-	{
-		ln -s x y 2> /dev/null &&
-		test -h y 2> /dev/null ||
-		no_symlinks=1 &&
-		rm -f y
-	}
+	rm -fr junk
 '
 
 if test_have_prereq CASE_INSENSITIVE_FS
@@ -40,7 +33,7 @@ fi
 
 test "$unibad" &&
 	say "will test on a unicode corrupting filesystem"
-test "$no_symlinks" &&
+test_have_prereq SYMLINKS ||
 	say "will test on a filesystem lacking symbolic links"
 
 if test_have_prereq CASE_INSENSITIVE_FS
@@ -57,18 +50,18 @@ test_expect_success "detection of case insensitive filesystem during repo init"
 '
 fi
 
-if test "$no_symlinks"
+if test_have_prereq SYMLINKS
 then
 test_expect_success "detection of filesystem w/o symlink support during repo init" '
 
-	v=$(git config --bool core.symlinks) &&
-	test "$v" = false
+	test_must_fail git config --bool core.symlinks ||
+	test "$(git config --bool core.symlinks)" = true
 '
 else
 test_expect_success "detection of filesystem w/o symlink support during repo init" '
 
-	test_must_fail git config --bool core.symlinks ||
-	test "$(git config --bool core.symlinks)" = true
+	v=$(git config --bool core.symlinks) &&
+	test "$v" = false
 '
 fi