lm32: Fix mixup of uint32 and uint32_t

Commit d23948b1 (lm32: add Milkymist
VGAFB support) introduced a stray usage of the softfloat uint32 type.

Use uint32_t instead.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Acked-by: NMichael Walle <michael@walle.cc>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

hw/milkymist-vgafb_template.h

@@ -39,7 +39,7 @@
 #elif BITS == 24
 #define COPY_PIXEL(to, r, g, b)                    \
     do {                                           \
-        uint32 tmp = rgb_to_pixel24(r, g, b);      \
+        uint32_t tmp = rgb_to_pixel24(r, g, b);    \
         *(to++) =         tmp & 0xff;              \
         *(to++) =  (tmp >> 8) & 0xff;              \
         *(to++) = (tmp >> 16) & 0xff;              \