bin/ksh: fix possible use of uninitialized variable

[Kevin Lo]

This diff fixes uninitialized variable warnings emitted by gcc 4.2.1
on i386/amd64.

Index: eval.c
===================================================================
RCS file: /cvs/src/bin/ksh/eval.c,v
retrieving revision 1.35
diff -u -p -r1.35 eval.c
--- eval.c      24 Mar 2010 08:27:26 -0000      1.35
+++ eval.c      14 Mar 2011 03:05:10 -0000
@@ -159,6 +159,8 @@ expand(char *cp,    /* input word */
        int make_magic;
        size_t len;
 
+       x.split = 0;
+       x.str = NULL;
        if (cp == NULL)
                internal_errorf(1, "expand(NULL)");
        /* for alias, readonly, set, typeset commands */
@@ -267,6 +269,7 @@ expand(char *cp,    /* input word */
                                int stype;
                                int slen;
 
+                               slen = -1;
                                sp = strchr(sp, '\0') + 1; /* skip variable */
                                type = varsub(&x, varname, sp, &stype, &slen);
                                if (type < 0) {