libtt: Resolve uninitialized warningss

cde/lib/tt/mini_isam/isbtree2.c

@@ -56,11 +56,11 @@ _isbtree_insert(Btree *btree, char *key)
     Keydesc2		*pkeydesc2 = btree->keydesc2;
     int			keylength = pkeydesc2->k2_len;
     int			nkeys;		     /* Number of keys in the page */
-    int			capac;
+    int			capac = 0;
     char		keybuf[MAXKEYSIZE];
     int	i;
     Blkno		blkno;
-    char		*pkp, *pkp2, *pkp3;
+    char		*pkp = NULL, *pkp2, *pkp3;
     Bufhdr		*kp2bhdr, *kp3bhdr;
     Blkno		blkno2, blkno3;
     int			level;

cde/lib/tt/mini_isam/isread.c

@@ -149,13 +149,13 @@ _amread(Bytearray *isfhandle, char *record, int *reclen,
         struct errcode *errcode)
 {
     Fcb			*fcb = NULL;
-    Recno		recnum2;
+    Recno		recnum2 = 0;
     int			err;
     Crp			*crp;
     Btree		*btree = NULL;
     Keydesc2		*pkeydesc2;
     char		keybuf1[MAXKEYSIZE], keybuf2[MAXKEYSIZE];
-    char		*pkey, *pkeynext;
+    char		*pkey = NULL, *pkeynext;
     int			skipbytes;
     int			ret;
     Bytearray		oldcurpos;

cde/lib/tt/mini_isam/isstart.c

@@ -158,7 +158,7 @@ _amstart(Bytearray *isfhandle, char *record, int *reclen,
          Bytearray *curpos, Recno *recnum, struct errcode *errcode)
 {
     Fcb			*fcb;
-    Recno		recnum2;
+    Recno		recnum2 = 0;
     int			err;
     Crp			*newcrp = NULL;
     char		recbuf [ISMAXRECLEN];