patch 8.2.3460: some type casts are not needed

Problem:    Some type casts are not needed.
Solution:   Remove unnecessary type casts. (closes #8934)
diff --git a/src/hardcopy.c b/src/hardcopy.c
index 069fa43..a04d5d8 100644
--- a/src/hardcopy.c
+++ b/src/hardcopy.c
@@ -588,7 +588,7 @@
      */
     if (mch_print_init(&settings,
 			curbuf->b_fname == NULL
-			    ? (char_u *)buf_spname(curbuf)
+			    ? buf_spname(curbuf)
 			    : curbuf->b_sfname == NULL
 				? curbuf->b_fname
 				: curbuf->b_sfname,
@@ -1931,7 +1931,7 @@
 	    break;
 
 	case PRT_DSC_ENDCOMMENTS_TYPE:
-	    // Wont find title or resource after this comment, stop searching
+	    // Won't find title or resource after this comment, stop searching
 	    seen_all = TRUE;
 	    break;