auxdisplay: linedisp: Move exported symbols to a namespace

Avoid unnecessary pollution of the global symbol namespace by
moving library functions in to a specific namespace and import
that into the drivers that make use of the functions.

For more info: https://lwn.net/Articles/760045/

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Author: andy-shev

drivers/auxdisplay/ht16k33.c

@@ -831,4 +831,5 @@ module_i2c_driver(ht16k33_driver);
 
 MODULE_DESCRIPTION("Holtek HT16K33 driver");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LINEDISP);
 MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>");

drivers/auxdisplay/img-ascii-lcd.c

@@ -298,3 +298,4 @@ module_platform_driver(img_ascii_lcd_driver);
 MODULE_DESCRIPTION("Imagination Technologies ASCII LCD Display");
 MODULE_AUTHOR("Paul Burton <paul.burton@mips.com>");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LINEDISP);

drivers/auxdisplay/line-display.c

@@ -263,7 +263,7 @@ int linedisp_register(struct linedisp *linedisp, struct device *parent,
 	put_device(&linedisp->dev);
 	return err;
 }
-EXPORT_SYMBOL_GPL(linedisp_register);
+EXPORT_SYMBOL_NS_GPL(linedisp_register, LINEDISP);
 
 /**
  * linedisp_unregister - unregister a character line display
@@ -276,6 +276,6 @@ void linedisp_unregister(struct linedisp *linedisp)
 	del_timer_sync(&linedisp->timer);
 	put_device(&linedisp->dev);
 }
-EXPORT_SYMBOL_GPL(linedisp_unregister);
+EXPORT_SYMBOL_NS_GPL(linedisp_unregister, LINEDISP);
 
 MODULE_LICENSE("GPL");