[snmp|manager] Dialyzer related changes

Changes to satisfy dialyzer. Including changing the definition
of the snmpm_network_interface behaviour (use the '-callback'
attribute instead of an explicit behaviour_info/1 function).

OTP-15932

1 files changed, 6 insertions, 6 deletions

diff --git a/lib/snmp/src/manager/snmpm_config.erl b/lib/snmp/src/manager/snmpm_config.erl
index cd9fecd4d4..4653d9822d 100644
--- a/lib/snmp/src/manager/snmpm_config.erl
+++ b/lib/snmp/src/manager/snmpm_config.erl
@@ -2738,16 +2738,16 @@ dets_backup(close, _Cont, _D, B) ->
     ok;
 dets_backup(read, Cont1, D, B) ->
     case dets:bchunk(D, Cont1) of
+        {error, _} = ERROR ->
+            ERROR;
+        '$end_of_table' ->
+            dets:close(B),
+            end_of_input;
         {Cont2, Data} ->
             F = fun(Arg) ->
                         dets_backup(Arg, Cont2, D, B)
                 end,
-            {Data, F};
-        '$end_of_table' ->
-            dets:close(B),
-            end_of_input;
-        Error ->
-            Error
+            {Data, F}
     end.