cmsis_rots_v1: fix for clearing signal flags in osSignalWait.

we use flag 0 in osSignalWait function to wait for
any single signal flag, but with this 0 flag,
it won't clear thread signal results as expected,
we need to check whether signal flag is 0 firstly.

Signed-off-by: Chen Peng1 <peng1.chen@intel.com>
1 file changed