Create the CombBLAS::SpParMat with the MPI_Comm from the input 'gridinfo_t'.
This prevents a warning/error from CombBLAS about using MPI_COMM_WORLD.

--- a/SRC/dHWPM_CombBLAS.hpp
+++ b/SRC/dHWPM_CombBLAS.hpp
@@ -52,7 +52,7 @@
     {
         printf("AWPM only supports square process grid. Retuning without a permutation.\n");
     }
-    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc;
+    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc(grid->comm);
     std::vector< std::vector < std::tuple<int_t,int_t,double> > > data(procs);
     
     /* ------------------------------------------------------------
--- a/SRC/zHWPM_CombBLAS.hpp
+++ b/SRC/zHWPM_CombBLAS.hpp
@@ -52,7 +52,7 @@
     {
         printf("AWPM only supports square process grid. Retuning without a permutation.\n");
     }
-    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc;
+    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc(grid->comm);
     std::vector< std::vector < std::tuple<int_t,int_t,double> > > data(procs);
     
     /* ------------------------------------------------------------
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<div class='path'>path: <a href='/guix/log/?id=dfcd1a876e8c5ded8a5ad67450deaed3a7be7475'>root</a>/<a href='/guix/log/gnu?id=dfcd1a876e8c5ded8a5ad67450deaed3a7be7475'>gnu</a>/<a href='/guix/log/gnu/packages?id=dfcd1a876e8c5ded8a5ad67450deaed3a7be7475'>packages</a>/<a href='/guix/log/gnu/packages/cybersecurity.scm?id=dfcd1a876e8c5ded8a5ad67450deaed3a7be7475'>cybersecurity.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/cybersecurity.scm?id=dfcd1a876e8c5ded8a5ad67450deaed3a7be7475&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-06 23:50:43 +0100'>2020-12-06</span></td><td><a href='/guix/commit/gnu/packages/cybersecurity.scm?id=71efb620cb2927f3028e4c2259ad5c3ff3fabd3b'>gnu: ropgadget: Update to 6.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cybersecurity.scm (ropgadget): Update to 6.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-02 00:28:52 +0200'>2020-06-02</span></td><td><a href='/guix/commit/gnu/packages/cybersecurity.scm?id=d038100ef08a03b9294e03e19f76d187fe5f9abe'>gnu: ropgadget: Update to 6.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cybersecurity.scm (ropgadget): Update to 6.3.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-03-26 22:53:02 +0100'>2020-03-26</span></td><td><a href='/guix/commit/gnu/packages/cybersecurity.scm?id=60eee3e6de2a11b425496bbdf90bfe1f807c8f49'>gnu: Add ROPgadget.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cybersecurity.scm: New file.
(ropgadget): New variable.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register the file.
</span></span></td><td>Jakub Kądziołka</td></tr>