MAINTAINERS/vsprintf: Update link to printk git tree

printk git tree has moved to printk/linux.git in February 2020.

Acked-by: Andy Shevchenko <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: pmladek

MAINTAINERS

@@ -20399,7 +20399,7 @@ M:	Sergey Senozhatsky <[email protected]>
 R:	Andy Shevchenko <[email protected]>
 R:	Rasmus Villemoes <[email protected]>
 S:	Maintained
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git
 F:	Documentation/core-api/printk-formats.rst
 F:	lib/test_printf.c
 F:	lib/test_scanf.c