remoteproc: stm32: Fix pointer assignement

Fix the assignment of the @state pointer - it is obviously wrong.

Acked-by: Arnaud Pouliquen <[e-mail]>
Fixes: 376ffdc04456 ("remoteproc: stm32: Properly set co-processor state when attaching")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Mathieu Poirier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/remoteproc/stm32_rproc.c

···
 		 * We couldn't get the coprocessor's state, assume
 		 * it is not running.
 		 */
-		state = M4_STATE_OFF;
+		*state = M4_STATE_OFF;
 		return 0;
 	}