Logic errors in mk_cheby.c introduced by commit r631

[griffithJ]

In r631, in four places in mk_cheby.c, the single statement in a "for" loop was split into two statements, but no curly braces were added. As a result the second half is only executed once after the loop exits, not for every iteration as the original code did. For example:

                                for (i = 0; i < nru; ++i) /* store coefficient rows for u */
-                                       if (Ts->cu[i].m = ncu[i])
+                                       Ts->cu[i].m = ncu[i];
+                                       if (Ts->cu[i].m)
                                                if ((p = Ts->cu[i].c =
                                                                (double *)pj_malloc(sizeof(double) * ncu[i])))
                                                        for (j = 0; j < ncu[i]; ++j)

Xcode 4.4 and later complains about dangling "else" statements so adding the missing curly braces fixes that warning as well.