next_ocur doesn't work when current cursor equals searched char

Created by: ducks

Reproduction: enter insert mode. enter "this is zest and this is more zest". use shift+space to return to normal mode. use gg to return to beginning of the line. use 'tz' or move to the first z. use 'tz'.

Expected behavior: cursor goes to the second z.

Actual behavior: cursor stays on first, current z.