MFC r198490

 Pull upstream patch to fix ee(1) crash when received SIGWINCH:

   modify _nc_wgetch() to check for a -1 in the fifo, e.g., after a
   SIGWINCH, and discard that value, to avoid confusing application
   (patch by Eygene Ryabinkin, FreeBSD bin/136223).

PR:		136223
Submitted by:	Eygene Ryabinkin
Obtained from:	ncurses-5.7-20091024 snapshot

contrib/ncurses/ncurses/base/lib_getch.c

@@ -476,6 +476,12 @@ _nc_wgetch(WINDOW *win,
 	    /* resizeterm can push KEY_RESIZE */
 	    if (cooked_key_in_fifo()) {
 		*result = fifo_pull(sp);
+		/*
+		 * Get the ERR from queue -- it is from WINCH,
+		 * so we should take it out, the "error" is handled.
+		 */
+		if (fifo_peek(sp) == -1)
+		    fifo_pull(sp);
 		returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 	    }
 	}