Revert "eicon: Fixed checkpatch warning"

This reverts commit e41eef8f.

It breaks the build, this symbol is refernced
by debugging macros in diddfunc.c
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/hardware/eicon/diva_didd.c

@@ -29,7 +29,7 @@ static char *main_revision = "$Revision: 1.13.6.4 $";
 static char *DRIVERNAME =
 	"Eicon DIVA - DIDD table (http://www.melware.net)";
 static char *DRIVERLNAME = "divadidd";
-static char *DRIVERRELEASE_DIDD = "2.0";
+char *DRIVERRELEASE_DIDD = "2.0";
 
 MODULE_DESCRIPTION("DIDD table driver for diva drivers");
 MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");