patch 9.1.0858: Coverity complains about dead code

Problem:  Coverity complains about dead code
          (after v9.1.0852)
Solution: adjust #ifdef FEAT_CLIPBOARD

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/register.c

@@ -198,6 +198,7 @@ valid_yank_reg(
 #endif
 							)
 	return TRUE;
+#ifndef FEAT_CLIPBOARD
     // clipboard support not enabled in this build
     else if (regname == '*' || regname == '+')
     {
@@ -205,6 +206,7 @@ valid_yank_reg(
 	msg_warn_missing_clipboard();
 	return FALSE;
     }
+#endif
     return FALSE;
 }
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    858,
 /**/
     857,
 /**/