fixes undefined behavior in parse_canframe (lib.c:187) by chaning tmp to

canid_t

Issue:
mkdir build && cd build
CC=clang cmake -DCMAKE_C_FLAGS="-fsanitize=address,undefined"
-DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address,undefined" .. && cmake
--build .

 echo "(0.0) can1 ffffffff#00000000" | ./log2long
can-utils/lib.c:187:23: runtime error: left shift of 15 by 28 places
cannot be represented in type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
/can-utils/lib.c:187:23 in
(0.0)  can1  3FFFFFFF

lib.c

@@ -159,7 +159,7 @@ int parse_canframe(char *cs, struct canfd_frame *cf) {
 	int i, idx, dlen, len;
 	int maxdlen = CAN_MAX_DLEN;
 	int ret = CAN_MTU;
-	unsigned char tmp;
+	canid_t tmp;
 
 	len = strlen(cs);
 	//printf("'%s' len %d\n", cs, len);