[#1907] shard: Return from Close after GC has stopped

[fyrchik]

Close #1907.

I hasn't been able to reproduce, but this should fix it.
Signed-off-by: Evgenii Stratonikov evgeniy@morphbits.ru

[codecov]

Codecov Report

Merging #1964 (1ccf643) into master (8796807) will decrease coverage by 0.02%.
The diff coverage is 17.24%.

@@            Coverage Diff             @@
##           master    #1964      +/-   ##
==========================================
- Coverage   30.58%   30.56%   -0.03%     
==========================================
  Files         378      379       +1     
  Lines       27589    27634      +45     
==========================================
+ Hits         8437     8445       +8     
- Misses      18455    18492      +37     
  Partials      697      697              

Impacted Files	Coverage Δ
cmd/neofs-adm/internal/modules/morph/config.go	0.00% <0.00%> (ø)
cmd/neofs-adm/internal/modules/morph/container.go	0.00% <0.00%> (ø)
cmd/neofs-adm/internal/modules/morph/epoch.go	0.00% <0.00%> (ø)
cmd/neofs-adm/internal/modules/morph/initialize.go	0.00% <0.00%> (ø)
...-adm/internal/modules/morph/initialize_register.go	0.00% <0.00%> (ø)
...-adm/internal/modules/morph/initialize_transfer.go	0.00% <0.00%> (ø)
...d/neofs-adm/internal/modules/morph/local_client.go	0.00% <0.00%> (ø)
...md/neofs-adm/internal/modules/morph/remove_node.go	0.00% <0.00%> (ø)
cmd/neofs-node/session.go	0.00% <0.00%> (ø)
pkg/local_object_storage/blobstor/delete.go	0.00% <0.00%> (ø)
... and 6 more

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