[PATCH net-next] bpf: fix a return in sockmap_get_from_fd()

[Dan Carpenter]

"map" is a valid pointer.  We wanted to return "err" instead.  Also
let's return a zero literal at the end.

Fixes: 174a79ff9515 ("bpf: sockmap with sk redirect support")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index d2f2bdf71ffa..b8cb1b3c9bfb 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1125,11 +1125,11 @@ static int sockmap_get_from_fd(const union bpf_attr 
*attr, int ptype)
                fdput(f);
                bpf_prog_put(prog1);
                bpf_prog_put(prog2);
-               return PTR_ERR(map);
+               return err;
        }
 
        fdput(f);
-       return err;
+       return 0;
 }
 
 static int bpf_prog_attach(const union bpf_attr *attr)