fix(st): use Boolean type for tests

This corrects MISRA C2012-14.4
The controlling expression of an if statement and the controlling
expression of an iteration-statement shall have essentially Boolean type.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Ibed7b87b50959f03dc5550dfaffacafd1d79feee
1 file changed