RDMA/uverbs: Convert command mask validity check function to be bool

The function validate_command_mask() returns only two results: success
or failure, so convert it to return bool instead of 0 and -1.
Reported-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/uverbs_main.c

@@ -635,7 +635,7 @@ struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file
 	return filp;
 }
 
-static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
+static bool verify_command_mask(struct ib_device *ib_dev, __u32 command)
 {
 	u64 mask;
 
@@ -645,9 +645,9 @@ static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
 		mask = ib_dev->uverbs_ex_cmd_mask;
 
 	if (mask & ((u64)1 << command))
-		return 0;
+		return true;
 
-	return -1;
+	return false;
 }
 
 static bool verify_command_idx(u32 command, bool extended)
@@ -706,7 +706,7 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 		goto out;
 	}
 
-	if (verify_command_mask(ib_dev, command)) {
+	if (!verify_command_mask(ib_dev, command)) {
 		ret = -EOPNOTSUPP;
 		goto out;
 	}