serial: remove calls to serial_assign()

Remove calls to serial_assign() that are failing now that it returns a
proper error code.  This calls were not actually doing anything
because they passed the name of a stdio_dev when a serial_device name
is exptectd.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>

common/cmd_nvedit.c

@@ -238,9 +238,6 @@ int env_check_apply(const char *name, const char *oldval,
 		/* Try assigning specified device */
 		if (console_assign(console, newval) < 0)
 			return 1;
-
-		if (serial_assign(newval) < 0)
-			return 1;
 #endif /* CONFIG_CONSOLE_MUX */
 	}
 

common/iomux.c

@@ -135,16 +135,6 @@ int iomux_doenv(const int console, const char *arg)
 		 */
 		if (console_assign(console, start[j]) < 0)
 			continue;
-		/*
-		 * This was taken from common/cmd_nvedit.c.
-		 * This will never work because serial_assign() returns
-		 * 1 upon error, not -1.
-		 * This would almost always return an error anyway because
-		 * serial_assign() expects the name of a serial device, like
-		 * serial_smc, but the user generally only wants to set serial.
-		 */
-		if (serial_assign(start[j]) < 0)
-			continue;
 		cons_set[cs_idx++] = dev;
 	}
 	free(console_args);