Clean up debug prints to use wpa_printf()

This converts most of the remaining perror() and printf() calls from
hostapd and wpa_supplicant to use wpa_printf().

Signed-off-by: Jouni Malinen <j@w1.fi>

src/utils/trace.c

@@ -33,7 +33,7 @@ static void get_prg_fname(void)
 	os_snprintf(exe, sizeof(exe) - 1, "/proc/%u/exe", getpid());
 	len = readlink(exe, fname, sizeof(fname) - 1);
 	if (len < 0 || len >= (int) sizeof(fname)) {
-		perror("readlink");
+		wpa_printf(MSG_ERROR, "readlink: %s", strerror(errno));
 		return;
 	}
 	fname[len] = '\0';