vl: Improve error message when we can't load fw_cfg from file

parse_fw_cfg() reports "can't load" without further details. Get the details from g_file_get_contents(), and include them in the error message.

Signed-off-by Li Qiang <[email protected]>

---
 vl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

vl.c +4 -2

index 1fcacc5..f0bd899 100644
@@ -2244,8 +2244,10 @@ static int parse_fw_cfg(void *opaque, QemuOpts
 *opts, Error **errp)
         size = strlen(str); /* NUL terminator NOT included in fw_cfg blob
 */
         buf = g_memdup(str, size);
     } else {
-        if (!g_file_get_contents(file, &buf, &size, NULL)) {
-            error_setg(errp, "can't load %s", file);
+        GError *err = NULL;
+        if (!g_file_get_contents(file, &buf, &size, &err)) {
+            error_setg(errp, "can't load %s: %s", file, err->message);
+            g_error_free(err);
             return -1;

         }
     }

--
1.8.3.1

parse_fw_cfg() reports "can't load" without further details. Get the details from g_file_get_contents(), and include them in the error message.

Signed-off-by Li Qiang <[email protected]>

---
 vl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

vl.c +0 -0

index 1fcacc5..f0bd899 100644
@@ -2244,8 +2244,10 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
         size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
         buf = g_memdup(str, size);