bug#50340: Fix remote-location in vc-git-log-incoming

[Dmitry Gutov]

On 02.09.2021 19:16, Juri Linkov wrote:
> -  (vc-git-command nil 0 nil "fetch")
> +  (vc-git-command nil 0 nil "fetch" (unless (string= remote-location "")
> +                                      remote-location))

I'm not sure which scenario this fixes (pressing RET after 'C-u C-x v I' 
works fine here), but it shouldn't hurt either.

So if you have a stable repro (some alternative 
completing-read-function?), you can go ahead and install.