fix(rmm): fix MISRA C:2012 Rule 10.4

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: I03630ef02c8c294a552ad10523d9c78091ce161a
diff --git a/runtime/rsi/logger.c b/runtime/rsi/logger.c
index aca1941..60dab92 100644
--- a/runtime/rsi/logger.c
+++ b/runtime/rsi/logger.c
@@ -98,7 +98,7 @@
 		break;
 	}
 
-	assert((cnt > 0) && (cnt < (int)(MAX_NAME_LEN + 1)));
+	assert((cnt > 0) && (cnt < (int)(MAX_NAME_LEN + 1U)));
 
 	(void)memset(buf + cnt, (int)' ', MAX_NAME_LEN - (size_t)cnt);