add launchpad bug reports without comments

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+qemu/block/qcow2.c:1942: possible performance problem ?
+
+I just ran static analyser cppcheck over today (20140520) qemu source code.
+
+It said many things, including
+
+[qemu/block/qcow2.c:1942] -> [qemu/block/qcow2.c:1943]: (performance) Buffer 'pad_buf' is being writ
+ten before its old content has been used.
+
+Source code is
+
+            memset(pad_buf, 0, s->cluster_size);
+            memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE);
+
+Worth tuning ?
+
+Similar problem here
+
+[qemu/block/qcow.c:815] -> [qemu/block/qcow.c:816]: (performance) Buffer 'pad_buf' is being written 
+before its old content has been used.
+
+and
+
+[qemu/hw/i386/acpi-build.c:1265] -> [qemu/hw/i386/acpi-build.c:1267]: (performance) Buffer 'dsdt' is
+ being written before its old content has been used.
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