Remove redundancy if condition statement (#2034)

Before the if condition, the sdslen(value) can not be zero or negative,
thus this if condition is redundancy , just remove it.

Signed-off-by: hwware <wen.hui.ware@gmail.com>

Author: hwware

src/t_string.c

@@ -553,14 +553,11 @@ void setrangeCommand(client *c) {
         o = dbUnshareStringValue(c->db, c->argv[1], o);
     }
 
-    if (sdslen(value) > 0) {
-        o->ptr = sdsgrowzero(o->ptr, offset + sdslen(value));
-        memcpy((char *)o->ptr + offset, value, sdslen(value));
-        signalModifiedKey(c, c->db, c->argv[1]);
-        notifyKeyspaceEvent(NOTIFY_STRING,
-                            "setrange", c->argv[1], c->db->id);
-        server.dirty++;
-    }
+    o->ptr = sdsgrowzero(o->ptr, offset + sdslen(value));
+    memcpy((char *)o->ptr + offset, value, sdslen(value));
+    signalModifiedKey(c, c->db, c->argv[1]);
+    notifyKeyspaceEvent(NOTIFY_STRING, "setrange", c->argv[1], c->db->id);
+    server.dirty++;
     addReplyLongLong(c, sdslen(o->ptr));
 }