unary operation made safe in error handler for Thermocouple

unary & is used with 32 bits operands. If the operand literal is not
explicitly expressed as  32bits, it can create random casting errors
depending on the Python version and the underlying implementation.

lib/max31855.py

@@ -68,9 +68,9 @@ class MAX31855(object):
         if data_32 is None:
             data_32 = self.data
         anyErrors = (data_32 & 0x10000) != 0    # Fault bit, D16
-        noConnection = (data_32 & 1) != 0       # OC bit, D0
-        shortToGround = (data_32 & 2) != 0      # SCG bit, D1
-        shortToVCC = (data_32 & 4) != 0         # SCV bit, D2
+        noConnection = (data_32 & 0x00000001) != 0       # OC bit, D0
+        shortToGround = (data_32 & 0x00000002) != 0      # SCG bit, D1
+        shortToVCC = (data_32 & 0x00000004) != 0         # SCV bit, D2
         if anyErrors:
             if noConnection:
                 raise MAX31855Error("No Connection")