libfdt: Add BADPHANDLE error string

The BADPHANDLE error was missing a string, leading to an <unknown error>
string being returned if you were to call fdt_strerror.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/libfdt/fdt_strerror.c b/libfdt/fdt_strerror.c
index 3cb357f..e00fcb1 100644
--- a/libfdt/fdt_strerror.c
+++ b/libfdt/fdt_strerror.c
@@ -69,6 +69,7 @@
 
 	FDT_ERRTABENT(FDT_ERR_BADOFFSET),
 	FDT_ERRTABENT(FDT_ERR_BADPATH),
+	FDT_ERRTABENT(FDT_ERR_BADPHANDLE),
 	FDT_ERRTABENT(FDT_ERR_BADSTATE),
 
 	FDT_ERRTABENT(FDT_ERR_TRUNCATED),