fix(st-clock): correct types in error messages

Replace wrong %d with the correct types.
This issue was found with the compilation flag:
-Wformat-signedness

Change-Id: Iec3817a245f964ce444b59561b777ce06c51a60a
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
1 file changed