Fix O2 chem_surfvals setting

Author: Steve Goldhaber

src/physics/cam/ghg_data.F90

@@ -146,7 +146,7 @@ subroutine trcmix(name, lchnk, ncol, clat, pmid, q)
 
    if (name == 'O2') then
 
-      q(:ncol,pver) = chem_surfvals_get('O2MMR', lchnk, ncol)
+      q(:ncol,:) = chem_surfvals_get('O2MMR')
 
    else if (name == 'CO2') then