FDS Source: Syntax correction

Author: cxp484

Source/fire.f90

@@ -1190,7 +1190,7 @@ SUBROUTINE CALC_AFT_REAC_AND_PROD(ZZ,ZZ_REAC,ZZ_PROD)
 
 
 CALL CALC_EQUIV_RATIO(ZZ(1:N_TRACKED_SPECIES), EQUIV)
-IF (SIM_MODE .NE. DNS_MODE .AND. USE_MIXED_ZN_AFT_TMP) THEN
+IF (SIM_MODE /= DNS_MODE .AND. USE_MIXED_ZN_AFT_TMP) THEN
    EQUIV = MAX(1.0_EB,EQUIV)
 ENDIF