patch 8.2.2828: Coverity complains about not checking rename() return value

Problem:    Coverity complains about not checking the rename() return value.
Solution:   Add "(void)", can't do anything in case of a failure.

src/fileio.c

@@ -3733,7 +3733,7 @@ vim_rename(char_u *from, char_u *to)
 			return 0;
 		    // Strange, the second step failed.  Try moving the
 		    // file back and return failure.
-		    mch_rename(tempname, (char *)from);
+		    (void)mch_rename(tempname, (char *)from);
 		    return -1;
 		}
 		// If it fails for one temp name it will most likely fail

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2828,
 /**/
     2827,
 /**/