Eliminate more dead stores.

Found by:	Clang static analyzer
MFC after:	7 days

lib/libc/gen/getcap.c

@@ -647,7 +647,7 @@ int
 cgetnext(char **bp, char **db_array)
 {
 	size_t len;
-	int done, hadreaderr, i, savederrno, status;
+	int done, hadreaderr, savederrno, status;
 	char *cp, *line, *rp, *np, buf[BSIZE], nbuf[BSIZE];
 	u_int dummy;
 
@@ -658,7 +658,7 @@ cgetnext(char **bp, char **db_array)
 		(void)cgetclose();
 		return (-1);
 	}
-	for(;;) {
+	for (;;) {
 		if (toprec && !gottoprec) {
 			gottoprec = 1;
 			line = toprec;
@@ -709,7 +709,6 @@ cgetnext(char **bp, char **db_array)
 		/*
 		 * Line points to a name line.
 		 */
-		i = 0;
 		done = 0;
 		np = nbuf;
 		for (;;) {

lib/libc/gen/getusershell.c

@@ -124,7 +124,7 @@ _local_initshells(rv, cb_data, ap)
 	if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
 		return NS_UNAVAIL;
 
-	sp = cp = line;
+	cp = line;
 	while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
 		while (*cp != '#' && *cp != '/' && *cp != '\0')
 			cp++;

lib/libc/gen/wordexp.c

@@ -320,7 +320,7 @@ we_check(const char *words, int flags)
 				if (c == '\0' || level != 0)
 					return (WRDE_SYNTAX);
 			} else
-				c = *--words;
+				--words;
 			break;
 		default:
 			break;

lib/libc/rpc/getnetconfig.c

@@ -412,13 +412,13 @@ void *handlep;
      * Noone needs these entries anymore, then frees them.
      * Make sure all info in netconfig_info structure has been reinitialized.
      */
-    q = p = ni.head;
+    q = ni.head;
     ni.eof = ni.ref = 0;
     ni.head = NULL;
     ni.tail = NULL;
     mutex_unlock(&ni_lock);
 
-    while (q) {
+    while (q != NULL) {
 	p = q->next;
 	if (q->ncp->nc_lookups != NULL) free(q->ncp->nc_lookups);
 	free(q->ncp);

lib/libc/rpc/key_call.c

@@ -302,7 +302,7 @@ int	vers;
 	void *localhandle;
 	struct netconfig *nconf;
 	struct netconfig *tpconf;
-	struct key_call_private *kcp = key_call_private_main;
+	struct key_call_private *kcp;
 	struct timeval wait_time;
 	struct utsname u;
 	int main_thread;

lib/libc/stdio/fgetws.c

@@ -89,7 +89,7 @@ fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
 	if (!__mbsinit(&fp->_mbstate))
 		/* Incomplete character */
 		goto error;
-	*wsp++ = L'\0';
+	*wsp = L'\0';
 	FUNLOCKFILE(fp);
 
 	return (ws);

lib/libc/yp/yplib.c

@@ -241,7 +241,7 @@ static bool_t
 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
     valdat *val)
 {
-	struct ypmatch_ent	*c = ypdb->cache;
+	struct ypmatch_ent	*c;
 
 	ypmatch_cache_expire(ypdb);