[PATCH] signed char portability fix

code using atm_cirange fields assumes that they are signed; make that
explicit by s/char/signed char/.
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/atmdev.h

@@ -155,8 +155,8 @@ struct atm_iobuf {
 #define ATM_CI_MAX      -1              /* use maximum range of VPI/VCI */
  
 struct atm_cirange {
-	char	vpi_bits;		/* 1..8, ATM_CI_MAX (-1) for maximum */
-	char	vci_bits;		/* 1..16, ATM_CI_MAX (-1) for maximum */
+	signed char	vpi_bits;	/* 1..8, ATM_CI_MAX (-1) for maximum */
+	signed char	vci_bits;	/* 1..16, ATM_CI_MAX (-1) for maximum */
 };
 
 /* for ATM_SETSC; actually taken from the ATM_VF number space */