lib/bootconfig.c:322:25: warning: comparison of integer expressions
  of different signedness: 'int' and 'size_t' [-Wsign-compare]
  lib/bootconfig.c:325:30: warning: conversion to 'size_t' from 'int'
  may change the sign of the result [-Wsign-conversion]

snprintf() returns int but size is size_t, so comparing ret >= size
and subtracting size -= ret involve mixed-sign operations.  Cast ret
at the comparison and subtraction sites; ret is known non-negative at
this point because the ret < 0 early return has already been taken.

Signed-off-by: Josh Law <objecting@objecting.org>
---
 lib/bootconfig.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/bootconfig.c b/lib/bootconfig.c
index e318b236e728..68a72dbc38fa 100644
--- a/lib/bootconfig.c
+++ b/lib/bootconfig.c
@@ -319,10 +319,10 @@ int __init xbc_node_compose_key_after(struct xbc_node *root,
 			       depth ? "." : "");
 		if (ret < 0)
 			return ret;
-		if (ret >= size) {
+		if (ret >= (int)size) {
 			size = 0;
 		} else {
-			size -= ret;
+			size -= (size_t)ret;
 			buf += ret;
 		}
 		total += ret;
-- 
2.34.1