misc: mic: SCIF Fix scif_get_new_port() error handling

BugLink: https://bugs.launchpad.net/bugs/1798539

[ Upstream commit a39284ae ]

There are only 2 callers of scif_get_new_port() and both appear to get
the error handling wrong.  Both treat zero returns as error, but it
actually returns negative error codes and >= 0 on success.

Fixes: e9089f43 ("misc: mic: SCIF open close bind and listen APIs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/misc/mic/scif/scif_api.c

@@ -370,11 +370,10 @@ int scif_bind(scif_epd_t epd, u16 pn)
 			goto scif_bind_exit;
 		}
 	} else {
-		pn = scif_get_new_port();
-		if (!pn) {
-			ret = -ENOSPC;
+		ret = scif_get_new_port();
+		if (ret < 0)
 			goto scif_bind_exit;
-		}
+		pn = ret;
 	}
 
 	ep->state = SCIFEP_BOUND;
@@ -648,13 +647,12 @@ int __scif_connect(scif_epd_t epd, struct scif_port_id *dst, bool non_block)
 			err = -EISCONN;
 		break;
 	case SCIFEP_UNBOUND:
-		ep->port.port = scif_get_new_port();
-		if (!ep->port.port) {
-			err = -ENOSPC;
-		} else {
-			ep->port.node = scif_info.nodeid;
-			ep->conn_async_state = ASYNC_CONN_IDLE;
-		}
+		err = scif_get_new_port();
+		if (err < 0)
+			break;
+		ep->port.port = err;
+		ep->port.node = scif_info.nodeid;
+		ep->conn_async_state = ASYNC_CONN_IDLE;
 		/* Fall through */
 	case SCIFEP_BOUND:
 		/*