env: cosmetic: drop assignment i = iomux_doenv()

iomux_doenv() can only return 0 or 1.
So there is no need to save its return value in variable i, as checking
its truth value within an if statement is enough.
Signed-off-by: NGerlando Falauto <gerlando.falauto@keymile.com>
Reviewed-by: NMarek Vasut <marex@denx.de>

common/cmd_nvedit.c

@@ -239,9 +239,8 @@ int _do_env_set(int flag, int argc, char * const argv[])
 		}
 
 #ifdef CONFIG_CONSOLE_MUX
-		i = iomux_doenv(console, argv[2]);
-		if (i)
-			return i;
+		if (iomux_doenv(console, argv[2]))
+			return 1;
 #else
 		/* Try assigning specified device */
 		if (console_assign(console, argv[2]) < 0)