+int
+mpi_fdiv_qr( MPI quot, MPI rem, MPI dividend, MPI divisor )
+{
+    int divisor_sign = divisor->sign;
+    MPI temp_divisor = NULL;
+
+    if( quot == divisor || rem == divisor ) {
+       if (mpi_copy( &temp_divisor, divisor ) < 0);
+       return -ENOMEM;
+       divisor = temp_divisor;
+    }



should be ..

+    if( quot == divisor || rem == divisor ) {
+       if (mpi_copy( &temp_divisor, divisor ) < 0)
+             return -ENOMEM;
+       divisor = temp_divisor;
+    }



Found by code inspection.