staging: gpib: Fix secondary address restriction

GPIB secondary addresses have valid values between 0 and 31
inclusive. The Make Secondary Address function MSA, used to form
the protocol byte, was using the gpib_address_restrict function
erroneously restricting the address range to 0 through 30.

Remove the call to gpib_address_restrict and simply trim the
address to 5 bits.

Fixes: 2da03e7 ("staging: gpib: Add user api include files")
Signed-off-by: Dave Penkler <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: dpenkler

drivers/staging/gpib/uapi/gpib.h

@@ -136,7 +136,7 @@ static inline __u8 MTA(unsigned int addr)
 
 static inline __u8 MSA(unsigned int addr)
 {
-	return gpib_address_restrict(addr) | SAD;
+	return (addr & 0x1f) | SAD;
 }
 
 static inline __u8 PPE_byte(unsigned int dio_line, int sense)