hw/sd/sdhci: Don't leak memory region in sdhci_sysbus_realize()

In sdhci_sysbus_realize() we override the initialization of
s->iomem that sdhci_common_realize() performs. However we
don't destroy the old memory region before reinitializing
it, which means that the memory allocated for mr->name in
memory_region_do_init() is leaked.

Since sdhci_initfn() already initializes s->io_ops to
&sdhci_mmio_ops, always use that in sdhci_common_realize()
and remove the now-unnecessary reinitialization of the
MMIO region from sdhci_sysbus_realize().

Spotted by clang's leak sanitizer.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20181204132952.2601-4-peter.maydell@linaro.org

hw/sd/sdhci.c

@@ -1371,7 +1371,7 @@ static void sdhci_common_realize(SDHCIState *s, Error **errp)
     s->buf_maxsz = sdhci_get_fifolen(s);
     s->fifo_buffer = g_malloc0(s->buf_maxsz);
 
-    memory_region_init_io(&s->iomem, OBJECT(s), &sdhci_mmio_ops, s, "sdhci",
+    memory_region_init_io(&s->iomem, OBJECT(s), s->io_ops, s, "sdhci",
                           SDHC_REGISTERS_MAP_SIZE);
 }
 
@@ -1565,9 +1565,6 @@ static void sdhci_sysbus_realize(DeviceState *dev, Error ** errp)
 
     sysbus_init_irq(sbd, &s->irq);
 
-    memory_region_init_io(&s->iomem, OBJECT(s), s->io_ops, s, "sdhci",
-            SDHC_REGISTERS_MAP_SIZE);
-
     sysbus_init_mmio(sbd, &s->iomem);
 }