Index: uspace/lib/drv/generic/remote_ieee80211.c
===================================================================
--- uspace/lib/drv/generic/remote_ieee80211.c	(revision fafb8e5dc8a80c87cf66270ca6f93d574a95471c)
+++ uspace/lib/drv/generic/remote_ieee80211.c	(revision b2f05e2af4e0a8aba1fb4f873e82649ef1c667b4)
@@ -79,5 +79,5 @@
 
 	if (res != EOK)
-		return (errno_t) res;
+		return res;
 
 	return rc;
@@ -144,7 +144,7 @@
 
 		if (rc_orig == EOK)
-			return (errno_t) rc;
-
-		return (errno_t) rc_orig;
+			return rc;
+
+		return rc_orig;
 	}
 
@@ -159,7 +159,7 @@
 
 		if (rc_orig == EOK)
-			return (errno_t) rc;
-
-		return (errno_t) rc_orig;
+			return rc;
+
+		return rc_orig;
 	}
 
@@ -182,5 +182,5 @@
 	rc = dhcp_discover(link_id);
 
-	return (errno_t) rc;
+	return rc;
 }
 
Index: uspace/lib/drv/generic/remote_usbdiag.c
===================================================================
--- uspace/lib/drv/generic/remote_usbdiag.c	(revision fafb8e5dc8a80c87cf66270ca6f93d574a95471c)
+++ uspace/lib/drv/generic/remote_usbdiag.c	(revision b2f05e2af4e0a8aba1fb4f873e82649ef1c667b4)
@@ -89,5 +89,5 @@
 	async_wait_for(req, &retval);
 
-	return (errno_t) retval;
+	return retval;
 }
 
@@ -123,5 +123,5 @@
 	async_wait_for(req, &retval);
 
-	return (errno_t) retval;
+	return retval;
 }
 
Index: uspace/lib/drv/generic/remote_usbhc.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhc.c	(revision fafb8e5dc8a80c87cf66270ca6f93d574a95471c)
+++ uspace/lib/drv/generic/remote_usbhc.c	(revision b2f05e2af4e0a8aba1fb4f873e82649ef1c667b4)
@@ -138,5 +138,5 @@
 
 	if (opening_request_rc)
-		return (errno_t) opening_request_rc;
+		return opening_request_rc;
 
 	usb_pipe_desc_t dest;
@@ -174,5 +174,5 @@
 	async_wait_for(opening_request, &opening_request_rc);
 
-	return (errno_t) opening_request_rc;
+	return opening_request_rc;
 }
 
@@ -223,5 +223,5 @@
 		*transferred = ipc_get_arg1(&call);
 
-	return (errno_t) opening_request_rc;
+	return opening_request_rc;
 }
 
Index: uspace/lib/drv/generic/remote_usbhid.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhid.c	(revision fafb8e5dc8a80c87cf66270ca6f93d574a95471c)
+++ uspace/lib/drv/generic/remote_usbhid.c	(revision b2f05e2af4e0a8aba1fb4f873e82649ef1c667b4)
@@ -182,11 +182,11 @@
 		/* Prefer return code of the opening request. */
 		if (opening_request_rc != EOK)
-			return (errno_t) opening_request_rc;
+			return opening_request_rc;
 		else
-			return (errno_t) data_request_rc;
+			return data_request_rc;
 	}
 
 	if (opening_request_rc != EOK)
-		return (errno_t) opening_request_rc;
+		return opening_request_rc;
 
 	size_t act_size = ipc_get_arg2(&data_request_call);
@@ -267,11 +267,11 @@
 		/* Prefer return code of the opening request. */
 		if (opening_request_rc != EOK)
-			return (errno_t) opening_request_rc;
+			return opening_request_rc;
 		else
-			return (errno_t) data_request_rc;
+			return data_request_rc;
 	}
 
 	if (opening_request_rc != EOK)
-		return (errno_t) opening_request_rc;
+		return opening_request_rc;
 
 	size_t act_size = ipc_get_arg2(&data_request_call);