esp: fix section mismatch warning

Not critical.

WARNING: drivers/char/esp.o(.text+0x278): Section mismatch in reference from the function show_serial_version() to the variable .init.data:serial_version
The function show_serial_version() references
the variable __initdata serial_version.
This is often because show_serial_version lacks a __initdata
annotation or the annotation of serial_version is wrong.

WARNING: drivers/char/esp.o(.text+0x27d): Section mismatch in reference from the function show_serial_version() to the variable .init.data:serial_name
The function show_serial_version() references
the variable __initdata serial_name.
This is often because show_serial_version lacks a __initdata
annotation or the annotation of serial_name is wrong.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Andrew J. Robinson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/esp.c

···
  * driver.
  */
 
-static void show_serial_version(void)
+static void __init show_serial_version(void)
 {
 	printk(KERN_INFO "%s version %s (DMA %u)\n",
 		serial_name, serial_version, dma);