Race condition with a threaded test with matrix on?

### Brief summary of bug

In ctsm5.3.065 I had the test

ERP_P64x2_D_Ld5.f10_f10_mg37.I1850Clm50Bgc.derecho_intel.clm-ciso--clm-matrixcnOn_ignore_warnings

fail at runtime. But, after resubmitting it worked fine.

This is just to bring awareness that this is a potential problem and a simple resubmit solves it.

### General bug information

**CTSM version you are using:** ctsm5.3.064-72-g4037e5a8d

**Does this bug cause significantly incorrect results in the model's science?** no

**Configurations affected:** threading with soil matrix on

### Details of bug

It dies in a SHR_ASSERT statement that's ensuring the matrix size of two sparse matrices multiplied together are the same size.

### Important output or errors that show the problem

cesm.log:
```
dec0933.hsn.de.hpc.ucar.edu 63: mosart decomp info proc = 63 begr = 255151 endr = 259200 numr = 4050
dec0933.hsn.de.hpc.ucar.edu 21: ERROR in SparseMatrixMultiplyMod.F90 at line 973
dec0933.hsn.de.hpc.ucar.edu 21: Image PC Routine Line Source
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000004842AF1 shr_abort_mod_mp_ 110 shr_abort_mod.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000004842A83 shr_abort_mod_mp_ 65 shr_abort_mod.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000004843A06 shr_assert_mod_mp 95 shr_assert_mod.F90.in
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000004843E0A shr_assert_mod_mp 112 shr_assert_mod.F90.in
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000003544EA7 sparsematrixmulti 973 SparseMatrixMultiplyMod.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000001629F29 cnsoilmatrixmod_m 614 CNSoilMatrixMod.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000003F2B6D6 cndrivermod_mp_cn 1101 CNDriverMod.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000001A77D09 cnvegetationfacad 1125 CNVegetationFacade.F90
dec0933.hsn.de.hpc.ucar.edu 21: cesm.exe 0000000000AA2FA1 clm_driver_mp_clm 1147 clm_driver.F90
```