mxraid/mxraid_assemble: Fix smartctl callup

Possible cause for the bug:

smartctl_info was only tested when starting the code, later
on the the switch from a simple device key to dev_list was
forgotten in this function.

mxraid/mxraid_assemble

@@ -735,7 +735,7 @@ exit;
         $serial_number =~ s/^\s+//;
       } else {
         if ($self->{root_priv}) {
-          $serial_number = smartctl_info($dev_list->[$i], 'Serial_Number');
+          $serial_number = smartctl_info('/dev/'.$dk, 'Serial_Number');
         } else {
           warn "# You must be root to query '$dk'.\n" if $self->{verbose} >= 1;
         }
@@ -801,6 +801,7 @@ exit;
       if ($parse) {
         my ($key, $val) = $_ =~ m/^([^:]+):\s*(.+)$/;
         next unless defined $key and defined $val;
+        $key =~ s/\s+/_/g;
         $smart_data{$key} = $val;
       }
     }