[patch] has('patch-8.1.0') returns 0

[h_east]

Hi Bram and developers,

:echo has('patch-8.1.0')
0

This should return 1.
A patch attached.

NOTE:
This issue was reported by Takuya Fujiwara.

--
Best regards,
Hirohito Higashi (h_east)

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diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index c14b6e671..9d46e9c2c 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -29,6 +29,8 @@ func Test_version()
   call assert_true(has('patch-6.9.999'))
   call assert_true(has('patch-7.1.999'))
   call assert_true(has('patch-7.4.123'))
+  call assert_true(has('patch-7.4.0'))
+  call assert_true(has('patch-8.1.0'))
 
   call assert_false(has('patch-7'))
   call assert_false(has('patch-7.4'))
diff --git a/src/version.c b/src/version.c
index ca6ac59f0..c858340c1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -1578,9 +1578,11 @@ highest_patch(void)
     int
 has_patch(int n)
 {
-    int		i;
+    size_t	i, size;
 
-    for (i = 0; included_patches[i] != 0; ++i)
+    size = sizeof included_patches / sizeof included_patches[0];
+
+    for (i = 0; i < size; ++i)
 	if (included_patches[i] == n)
 	    return TRUE;
     return FALSE;