Show syscall error message if file move failed (#990)

* Show syscall error message if file move failed

* Check for failure during move syscall after upload

lib/LANraragi/Model/Upload.pm

@@ -110,11 +110,13 @@ sub handle_incoming_file {
 
     # Move the file to the content folder.
     # Move to a .upload first in case copy to the content folder takes a while...
-    move( $tempfile, $output_file . ".upload" );
+    move( $tempfile, $output_file . ".upload" ) or return ( 0, $id, $name, "The file couldn't be moved to your content folder: $!" );
 
     # Then rename inside the content folder itself to proc Shinobu.
-    move( $output_file . ".upload", $output_file );
+    move( $output_file . ".upload", $output_file ) or  return ( 0, $id, $name, "The file couldn't be renamed in your content folder: $!" );
 
+    # If the move didn't signal an error, but still doesn't exist, something is quite spooky indeed!
+    # Really funky permissions that prevents viewing folder contents?
     unless ( -e $output_file ) {
         return ( 0, $id, $name, "The file couldn't be moved to your content folder!" );
     }