patch 9.1.0579: Ex command is still executed after giving E1247

Problem:  Ex command is still executed after giving E1247.
Solution: Indicate the error properly and set cmd to NULL.
          (zeertzjq)

closes: #15241

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 614ba20..c90d64d 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -4698,6 +4698,7 @@
 		if (n == MAXLNUM)
 		{
 		    emsg(_(e_line_number_out_of_range));
+		    cmd = NULL;
 		    goto error;
 		}
 	    }
@@ -4728,6 +4729,7 @@
 		    if (lnum >= 0 && n >= LONG_MAX - lnum)
 		    {
 			emsg(_(e_line_number_out_of_range));
+			cmd = NULL;
 			goto error;
 		    }
 		    lnum += n;
diff --git a/src/testdir/test_excmd.vim b/src/testdir/test_excmd.vim
index 221ceb0..3b7e489 100644
--- a/src/testdir/test_excmd.vim
+++ b/src/testdir/test_excmd.vim
@@ -703,6 +703,8 @@
   call setline(1, range(100))
   call assert_fails('|.44444444444444444444444', 'E1247:')
   call assert_fails('|.9223372036854775806', 'E1247:')
+  call assert_fails('.44444444444444444444444d', 'E1247:')
+  call assert_equal(range(100)->map('string(v:val)'), getline(1, '$'))
 
   $
   yank 77777777777777777777
diff --git a/src/version.c b/src/version.c
index c87d378..ac04272 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    579,
+/**/
     578,
 /**/
     577,