hwmon/lm78: Drop REALLY_SLOW_IO setting

In lm78_isa_found() there is REALLY_SLOW_IO defined around some port
accesses, probably in order to wait between multiple accesses.

Unfortunately this isn't making any difference compared to not having
this define since more than a decade, as REALLY_SLOW_IO needs to be
defined while "#include <asm/io.h>" is called to have an effect.

As there seem not to be any outstanding issues in spite of this having
no effect, just drop the "#define" and add a remark to the related
comment.

Signed-off-by: Juergen Gross <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/lm78.c

···
 		}
 	}
 
-#define REALLY_SLOW_IO
 	/*
 	 * We need the timeouts for at least some LM78-like
 	 * chips. But only if we read 'undefined' registers.
+	 * There used to be a "#define REALLY_SLOW_IO" to enforce that, but
+	 * this has been without any effect since more than a decade, so it
+	 * has been dropped.
 	 */
 	val = inb_p(address + 1);
 	if (inb_p(address + 2) != val
 	 || inb_p(address + 3) != val
 	 || inb_p(address + 7) != val)
 		goto release;
-#undef REALLY_SLOW_IO
 
 	/*
 	 * We should be able to change the 7 LSB of the address port. The