wlantest: Fix the injection of protected broadcast frames

Injecting protected broadcast frames fails because of the unnecessary
null check for sta. In case of broadcast frames sta can be null, so
remove the check.

Reported-by: Janardhan R <janardhanr@posedge.com>
Signed-hostap: Chaitanya T K <chaitanyatk@posedge.com>

wlantest/inject.c

@@ -285,9 +285,8 @@ int wlantest_inject(struct wlantest *wt, struct wlantest_bss *bss,
 		return -1;
 	}
 
-	if (prot != WLANTEST_INJECT_UNPROTECTED &&
-	    (bss == NULL || sta == NULL)) {
-		wpa_printf(MSG_INFO, "No BSS/STA information to inject "
+	if (prot != WLANTEST_INJECT_UNPROTECTED && bss == NULL) {
+		wpa_printf(MSG_INFO, "No BSS information to inject "
 			   "protected frames");
 		return -1;
 	}