BITCOUNT: fix segmentation fault. #582

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2 src/bitops.c
@@ -357,7 +357,7 @@ void bitcountCommand(redisClient *c) {
if (end < 0) end = strlen+end;
if (start < 0) start = 0;
if (end < 0) end = 0;
- if ((unsigned)end >= strlen) end = strlen-1;
+ if (end >= strlen) end = strlen-1;
} else if (c->argc == 2) {
/* The whole string. */
start = 0;