Correcting mistake in f_getMonth function

Signed-off-by: reinaortega <miguelangel.reinaortega@etsi.org>

LibOneM2M/OneM2M_Functions.ttcn

@@ -3482,9 +3482,7 @@ module OneM2M_Functions {
 			var integer i;
 			
 			for(i := 4; i <= 5; i := i+1){
-				if(p_timestamp[i] != "0") {
-					v_month := v_month & p_timestamp[i];
-				}
+				v_month := v_month & p_timestamp[i];
 			}
 			return str2int(v_month);