prevent unintended sign extension errors

When an unsigned char is shifted << 24 bits its type will be
promoted to signed 32-bits.   If the value is then assigned to
an unsigned 64-bit value sign extension will occur.

Prevent the unwanted sign extension by explicitly casting the
value to unsigned long before shifting.

Change-Id: Iabeac0f17dc3229a2dc89abe71960a8ffbf523f8

kadmin/rpc.c

@@ -142,7 +142,7 @@ parse_name(const unsigned char *p, size_t len,
     /* MECHNAME_LEN */
     if (len < 4)
 	return 1;
-    l = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+    l = (unsigned long)p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
     len -= 4;
     p += 4;