src/usermod.c: $user_home: Remove all trailing '/'s

[alejandro-colomar]

FTR: I'm not entirely sure if an empty string can arrive here. It might be that the streq() check is dead code, but I'm not sure, so I put it. It also makes the code more robust.

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Revisions:

v1b

• Rebase

$ git rd 
1:  5290b783 ! 1:  e6df54ea src/usermod.c: $user_newhome: Remove all trailing '/'s
    @@ src/usermod.c
      #include "time/day_to_str.h"
      #include "typetraits.h"
      
    -@@ src/usermod.c: static void new_pwent (struct passwd *pwent)
    +@@ src/usermod.c: static void new_pwent (struct passwd *pwent, bool process_selinux)
                         "change user '%s' home from '%s' to '%s'",
                         pwent->pw_name, pwent->pw_dir, user_newhome));
      

v1c

• Rebase

$ git rd 
1:  e6df54ea ! 1:  89a8623f src/usermod.c: $user_newhome: Remove all trailing '/'s
    @@ src/usermod.c
     @@
      #include "string/strcmp/streq.h"
      #include "string/strcmp/strprefix.h"
    - #include "string/strdup/xstrdup.h"
    + #include "string/strdup/strdup.h"
     +#include "string/strspn/stprspn.h"
      #include "time/day_to_str.h"
      #include "typetraits.h"