fdtdec: correct test on return of fdt_node_offset_by_phandle
The result of fdt_node_offset_by_phandle is negative for error, so this patch corrects the check of this result in fdtdec_parse_phandle_with_args. This patch allows to have the same behavior with or without OF_LIVE for the function dev_read_phandle_with_args with cell_name = NULL and with invalid phandle. Signed-off-by:Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by:
Simon Glass <sjg@chromium.org>
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