Do not write a value for strings in htab.

The assignment is unnecessary, and was overwriting the first element in the bucket (not the added string's value) in the case of a collision.

libtvm/tvm_htab.c

@@ -127,7 +127,6 @@ int htab_add(tvm_htab_t *htab, const char *k, int v)
 int htab_add_str(tvm_htab_t *htab, const char *key, const void *valptr, int len)
 {
 	int hash = htab_add(htab, key, 0);
-	htab->nodes[hash]->value = hash;
 	htab->nodes[hash]->valptr = calloc(len, sizeof(char));
 	memcpy(htab->nodes[hash]->valptr, valptr, len);
 	return hash;
@@ -161,4 +160,4 @@ char *htab_find_str(tvm_htab_t *htab, const char *key)
 	}
 
 	return NULL;
-}
+}