FDS Source: Fix Issue firemodels#3930 use ZZ for duct and not gas for…

… Q_LEAK

Former-commit-id: b9b4239ac62165cbb77d1be9c03376f73c3a3fa3 [formerly a9b7027f14ffa3a4018430b75d862b9911be8595]
Former-commit-id: 861eadbd2c3b8cbc2f26a65014171a19d7e65bb9
Former-commit-id: 7aa7e7b

FDS_Source/wall.f90

@@ -1392,9 +1392,8 @@ SUBROUTINE HVAC_BC
             WC%ONE_D%QCONF = 0._EB
          ELSE
             IF (DUCT(DU)%LEAK_ENTHALPY) THEN
-               ZZ_GET(1:N_TRACKED_SPECIES) = ZZP(IIG,JJG,KKG,:)
-               CALL GET_AVERAGE_SPECIFIC_HEAT(ZZ_GET,CP_G,TMP(IIG,JJG,KKG))
                ZZ_GET(1:N_TRACKED_SPECIES) = NODE_ZZ_EX(WC%NODE_INDEX,1:N_TRACKED_SPECIES,1)
+               CALL GET_AVERAGE_SPECIFIC_HEAT(ZZ_GET,CP_G,TMP(IIG,JJG,KKG))
                CALL GET_AVERAGE_SPECIFIC_HEAT(ZZ_GET,CP_D,NODE_TMP_EX(WC%NODE_INDEX,1))
                WC%Q_LEAK = -MFT*(CP_D*NODE_TMP_EX(WC%NODE_INDEX,1)-CP_G*TMP(IIG,JJG,KKG))*WC%RDN
             ENDIF
@@ -1416,7 +1415,6 @@ SUBROUTINE HVAC_BC
    ELSE
       WC%ONE_D%MASSFLUX(1:N_TRACKED_SPECIES) = -NODE_ZZ_EX(WC%NODE_INDEX,1:N_TRACKED_SPECIES,1)*MFT
    ENDIF
-
 ENDDO WALL_CELL_LOOP
 
 END SUBROUTINE HVAC_BC