Fix annual simulation check for wave module

ssc/cmod_mhk_wave.cpp

@@ -606,7 +606,7 @@ class cm_mhk_wave : public compute_module
             }
             size_t hour_step = 1.0;
             if (is_annual) {
-                size_t hour_step = number_hours / number_records;
+                hour_step = number_hours / number_records;
             }
 
             ssc_number_t sig_wave_height_index = 0;