Remove assorted dead code.

Assignments that are overwritten shortly afterwards and never used,
and a completely unused variable. Also, the bogus array access in
testbn.c could have actually accessed one beyond the array limit
(though of course it's only in a test harness).

import.c

@@ -1547,15 +1547,11 @@ struct ssh2_userkey *openssh_new_read(const Filename *filename,
     int i;
     struct ssh2_userkey *retval = NULL;
     const char *errmsg;
-    unsigned char *blob;
-    int blobsize = 0;
     unsigned checkint0, checkint1;
     const void *priv, *string;
     int privlen, stringlen, key_index;
     const struct ssh_signkey *alg = NULL;
 
-    blob = NULL;
-
     if (!key)
 	return NULL;
 
@@ -1721,10 +1717,6 @@ struct ssh2_userkey *openssh_new_read(const Filename *filename,
     retkey = NULL;                     /* prevent the free */
 
     error:
-    if (blob) {
-        smemclr(blob, blobsize);
-        sfree(blob);
-    }
     if (retkey) {
         sfree(retkey->comment);
         if (retkey->data) {

sshzlib.c

@@ -267,7 +267,6 @@ static void lz77_compress(struct LZ77Context *ctx,
 	    }
 	} else {
 	    nmatch = 0;
-	    hash = INVALID;
 	}
 
 	if (nmatch > 0) {

testbn.c

@@ -82,8 +82,6 @@ int main(int argc, char **argv)
                 val = val * 16 + fromxdigit(start[i+1]);
                 *q++ = val;
             }
-
-            ptrs[ptrnum] = q;
         }
 
         if (!strcmp(buf, "mul")) {

windows/winutils.c

@@ -365,7 +365,7 @@ void split_into_argv(char *cmdline, int *argc, char ***argv,
 
 		    if (quotes > 0) {
 			/* Outside a quote segment, a quote starts one. */
-			if (!quote) quotes--, quote = 1;
+			if (!quote) quotes--;
 
 			/* Now we produce (n+1)/3 literal quotes... */
 			for (i = 3; i <= quotes+1; i += 3) *q++ = '"';