[gparted] Refactor reiser4::read_uuid() into if fail return early pattern

[Curtis Gedak <gedakc src gnome org>]

commit 2a76af5beb4c609b372e635ef7a7d3dc68632104
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sat Mar 20 15:45:50 2021 +0000

    Refactor reiser4::read_uuid() into if fail return early pattern

 src/reiser4.cc | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)
---
diff --git a/src/reiser4.cc b/src/reiser4.cc
index 30e68e63..ed4e1c6c 100644
--- a/src/reiser4.cc
+++ b/src/reiser4.cc
@@ -127,23 +127,24 @@ void reiser4::read_label( Partition & partition )
        }
 }
 
+
 void reiser4::read_uuid( Partition & partition )
 {
-       if ( ! Utils::execute_command( "debugfs.reiser4 " + Glib::shell_quote( partition.get_path() ),
-                                      output, error, true )                                           )
+       exit_status = Utils::execute_command("debugfs.reiser4 " + Glib::shell_quote( partition.get_path()),
+                                            output, error, true);
+       if (exit_status != 0)
        {
-               partition .uuid = Utils::regexp_label( output, "uuid:[[:blank:]]*(" 
RFC4122_NONE_NIL_UUID_REGEXP ")" ) ;
+               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, "uuid:[[:blank:]]*(" RFC4122_NONE_NIL_UUID_REGEXP ")");
 }
 
+
 bool reiser4::create( const Partition & new_partition, OperationDetail & operationdetail )
 {
        return ! execute_command( "mkfs.reiser4 --force --yes --label " +