patch 8.2.3020: unreachable code

Problem:    Unreachable code.
Solution:   Remove the code. (closes #8406)

src/ex_docmd.c

@@ -4523,9 +4523,6 @@ invalid_range(exarg_T *eap)
 #endif
 		break;
 	    case ADDR_UNSIGNED:
-		if (eap->line2 < 0)
-		    return _(e_invrange);
-		break;
 	    case ADDR_NONE:
 		// Will give an error elsewhere.
 		break;

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3020,
 /**/
     3019,
 /**/