r.gwflow: Fix Dereference before Null Check issue in main.c #6336
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This pull request fixes issue identified by Coverity Scan (CID : 1270269, 1270272, 1270275, 1270276, 1270278, 1270279)
CID : 1270269 is false positive i think because it is checked as NULL in the function before returning and G_fatal_error is used but still to silence the warning i used G_fatal_error again to check the return value. Ideally it won't reach the G_fatal_error where return value is checked but it will silence the warning.