hw/net/smc91c111: Use qemu_log_mask(UNIMP) instead of fprintf

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20180624040609.17572-15-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/net/smc91c111.c

@@ -362,10 +362,14 @@ static void smc91c111_writeb(void *opaque, hwaddr offset,
             SET_HIGH(gpr, value);
             return;
         case 12: /* Control */
-            if (value & 1)
-                fprintf(stderr, "smc91c111:EEPROM store not implemented\n");
-            if (value & 2)
-                fprintf(stderr, "smc91c111:EEPROM reload not implemented\n");
+            if (value & 1) {
+                qemu_log_mask(LOG_UNIMP,
+                              "smc91c111: EEPROM store not implemented\n");
+            }
+            if (value & 2) {
+                qemu_log_mask(LOG_UNIMP,
+                              "smc91c111: EEPROM reload not implemented\n");
+            }
             value &= ~3;
             SET_LOW(ctr, value);
             return;