Fix unmatched return values in migrate_from_dets after clause

Both dets:close/1 and file:rename/2 return values that need to be
explicitly ignored to satisfy the compiler's unmatched_returns check.

Made-with: Cursor

Author: kjnilsson

rebar3.crashdump

@@ -0,0 +1,22 @@
+Error: terminated
+[{io,format,
+     ["===> Verifying dependencies...~n",[]],
+     [{file,"io.erl"},
+      {line,202},
+      {error_info,#{cause => {io,terminated},module => erl_stdlib_errors}}]},
+ {rebar_prv_install_deps,do,1,
+                         [{file,"/home/runner/work/rebar3/rebar3/apps/rebar/src/rebar_prv_install_deps.erl"},
+                          {line,73}]},
+ {rebar_core,do,2,
+             [{file,"/home/runner/work/rebar3/rebar3/apps/rebar/src/rebar_core.erl"},
+              {line,155}]},
+ {rebar3,run_aux,2,
+         [{file,"/home/runner/work/rebar3/rebar3/apps/rebar/src/rebar3.erl"},
+          {line,205}]},
+ {rebar3,main,1,
+         [{file,"/home/runner/work/rebar3/rebar3/apps/rebar/src/rebar3.erl"},
+          {line,66}]},
+ {init,start_it,1,[]},
+ {init,start_em,1,[]},
+ {init,do_boot,3,[]}]
+

src/ra_log_meta.erl

@@ -381,9 +381,9 @@ migrate_from_dets(MetaDets, ShuState0, _TblName) ->
 
         {Count, ShuState2}
     after
-        dets:close(DetsTable),
+        _ = dets:close(DetsTable),
         %% Rename DETS file to .migrated
-        file:rename(MetaDets, MetaDets ++ ".migrated")
+        _ = file:rename(MetaDets, MetaDets ++ ".migrated")
     end.
 
 %% Check if WAL usage exceeds watermark and start compaction if needed