pc: Fix error reporting for -boot once

Commit 0ecdffbb created pc_boot_set() for use from monitor command
"boot_set", via qemu_boot_set().  pc_boot_set() reports errors to
cur_mon, which works fine for monitor code.

Commit e0f084bf reused the function int reset handler
restore_boot_devices().  Use of cur_mon is problematic in that
context.  For instance, the "Too many boot devices for PC" error for
"-boot order=abcdefgh,once=c" goes to the monitor instead of stderr.
The monitor may not even exist.

Fix by switching to qemu_error().

1 files changed, 3 insertions, 4 deletions

diff --git a/hw/pc.c b/hw/pc.c
index e50a48848d..0c190439be 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -234,7 +234,6 @@ static int boot_device2nibble(char boot_device)
  and used there as well */
 static int pc_boot_set(void *opaque, const char *boot_device)
 {
-    Monitor *mon = cur_mon;
 #define PC_MAX_BOOT_DEVICES 3
     RTCState *s = (RTCState *)opaque;
     int nbds, bds[3] = { 0, };
@@ -242,14 +241,14 @@ static int pc_boot_set(void *opaque, const char *boot_device)
 
     nbds = strlen(boot_device);
     if (nbds > PC_MAX_BOOT_DEVICES) {
-        monitor_printf(mon, "Too many boot devices for PC\n");
+        qemu_error("Too many boot devices for PC\n");
         return(1);
     }
     for (i = 0; i < nbds; i++) {
         bds[i] = boot_device2nibble(boot_device[i]);
         if (bds[i] == 0) {
-            monitor_printf(mon, "Invalid boot device for PC: '%c'\n",
-                           boot_device[i]);
+            qemu_error("Invalid boot device for PC: '%c'\n",
+                       boot_device[i]);
             return(1);
         }
     }