env: add failing trace in env_save
Add trace in env save to indicate any errors to end user and avoid
silent output when the command 'env save' is not executed.
Signed-off-by: 
Patrick Delaunay <patrick.delaunay@st.com>
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Add trace in env save to indicate any errors to end user and avoid
silent output when the command 'env save' is not executed.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>