fix a false-positive warnings with gcc 10.2+ and -Wall -O2 - sfeed_curses - sfeed curses UI (now part of sfeed, development is in sfeed)
 (HTM) git clone git://git.codemadness.org/sfeed_curses
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       ---
 (DIR) commit 8ebfb75d9ca26ce24a76aa3dc956182bd06f5b59
 (DIR) parent 40bfd7846f72a063eede961e578f0ae667727b3f
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Sun, 25 Jul 2021 14:00:43 +0200
       
       fix a false-positive warnings with gcc 10.2+ and -Wall -O2
       
       These conditions cannot happen though.
       
       Noticed on Oasis Linux:
       https://github.com/oasislinux/oasis/blob/master/pkg/sfeed_curses/gen.lua
       
       See also commit 61c48746013c47d77b47c0b7606882983b185b6d
       
       Diffstat:
         M sfeed_curses.c                      |       4 +++-
       
       1 file changed, 3 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/sfeed_curses.c b/sfeed_curses.c
       @@ -2358,12 +2358,14 @@ nextpage:
                                p = &panes[PaneFeeds];
                                if ((row = pane_row_get(p, p->pos)))
                                        f = row->data;
       +                        else
       +                                f = NULL;
        
                                onlynew = !onlynew;
                                updatesidebar();
        
                                /* try to find the same feed in the pane */
       -                        if (row && f && f->totalnew &&
       +                        if (f && f->totalnew &&
                                    (pos = feeds_row_get(p, f)) != -1)
                                        pane_setpos(p, pos);
                                else