Cleanup libsquashfs invalid argument error codes

 - Add an explicit "you're holding it wrong" error code.
 - Consistently return error codes and not have some special places
   where -1 is returned.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/sqfs/xattr.c b/lib/sqfs/xattr.c
index 6ce6b9a..909a9a5 100644
--- a/lib/sqfs/xattr.c
+++ b/lib/sqfs/xattr.c
@@ -7,6 +7,7 @@
 #define SQFS_BUILDING_DLL
 #include "config.h"
 #include "sqfs/xattr.h"
+#include "sqfs/error.h"
 
 #include <string.h>
 
@@ -32,7 +33,7 @@ int sqfs_get_xattr_prefix_id(const char *key)
 		}
 	}
 
-	return -1;
+	return SQFS_ERROR_UNSUPPORTED;
 }
 
 const char *sqfs_get_xattr_prefix(E_SQFS_XATTR_TYPE id)