[gparted] Refactor fat16::read_uuid() into if fail return early pattern (!104)

[Curtis Gedak <gedakc src gnome org>]

commit ff177038e55675b9423361d4ee1a89e16684e5e4
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sat Jun 18 09:36:49 2022 +0100

    Refactor fat16::read_uuid() into if fail return early pattern (!104)
    
    Closes !104 - Add Alpine Linux CI jobs and resolve label and UUID issues
                  with FAT16/32

 src/fat16.cc | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)
---
diff --git a/src/fat16.cc b/src/fat16.cc
index 5f1ae66d..9b0d08f4 100644
--- a/src/fat16.cc
+++ b/src/fat16.cc
@@ -219,26 +219,26 @@ bool fat16::write_label( const Partition & partition, OperationDetail & operatio
        return ! execute_command( cmd, operationdetail, EXEC_CHECK_STATUS );
 }
 
-void fat16::read_uuid( Partition & partition )
-{
-       Glib::ustring cmd = "mdir -f :: -i " + Glib::shell_quote( partition.get_path() );
 
-       if ( ! Utils::execute_command( cmd, output, error, true ) )
+void fat16::read_uuid(Partition& partition)
+{
+       exit_status = Utils::execute_command("mdir -f :: -i " + Glib::shell_quote(partition.get_path()),
+                                            output, error, true);
+       if (exit_status != 0)
        {
-               partition .uuid = Utils::regexp_label( output, "Volume Serial Number 
is[[:blank:]]([^[:space:]]+)" ) ;
-               if ( partition .uuid == "0000-0000" )
-                       partition .uuid .clear() ;
+               if (! output.empty())
+                       partition.push_back_message(output);
+               if (! error.empty())
+                       partition.push_back_message(error);
+               return;
        }
-       else
-       {
-               if ( ! output .empty() )
-                       partition.push_back_message( output );
 
-               if ( ! error .empty() )
-                       partition.push_back_message( error );
-       }
+       partition.uuid = Utils::regexp_label(output, "Volume Serial Number is[[:blank:]]([^[:space:]]+)");
+       if (partition.uuid == "0000-0000")
+               partition.uuid.clear();
 }
 
+
 bool fat16::write_uuid( const Partition & partition, OperationDetail & operationdetail )
 {
        Glib::ustring cmd = "mlabel -s -n :: -i " + Glib::shell_quote( partition.get_path() );