vi: placate "warning: shifting a negative signed value is undefined"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/editors/vi.c b/editors/vi.c
index f8fab7028..51dfc1209 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -3490,7 +3490,7 @@ static void do_cmd(int c)
                 } while (--cmdcnt > 0);
                 break;
         case '{':                       // {- move backward paragraph
-                q = char_search(dot, "\n\n", (BACK << 1) | FULL);
+                q = char_search(dot, "\n\n", ((unsigned)BACK << 1) | FULL);
                 if (q != NULL) {        // found blank line
                         dot = next_line(q);     // move to next blank line
                 }