tests/qemu-iotests: Fix output of qemu-io related tests

One of the recent commits changed the way qemu-io prints out its
errors and warnings - they are now prefixed with the program name.
We've got to adapt the iotests accordingly to prevent that they
are failing.

Fixes: 99e98d7c9fc1a1639fad ("qemu-io: Use error_[gs]et_progname()")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/tests/qemu-iotests/075.out b/tests/qemu-iotests/075.out
index b234b75..4f3871d 100644
--- a/tests/qemu-iotests/075.out
+++ b/tests/qemu-iotests/075.out
@@ -9,23 +9,23 @@
 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == block_size must be a multiple of 512 ==
-can't open device TEST_DIR/simple-pattern.cloop: block_size 513 must be a multiple of 512
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: block_size 513 must be a multiple of 512
 
 == block_size cannot be zero ==
-can't open device TEST_DIR/simple-pattern.cloop: block_size cannot be zero
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: block_size cannot be zero
 
 == huge block_size ===
-can't open device TEST_DIR/simple-pattern.cloop: block_size 4294966784 must be 64 MB or less
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: block_size 4294966784 must be 64 MB or less
 
 == offsets_size overflow ===
-can't open device TEST_DIR/simple-pattern.cloop: n_blocks 4294967295 must be 536870911 or less
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: n_blocks 4294967295 must be 536870911 or less
 
 == refuse images that require too many offsets ===
-can't open device TEST_DIR/simple-pattern.cloop: image requires too many offsets, try increasing block size
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: image requires too many offsets, try increasing block size
 
 == refuse images with non-monotonically increasing offsets ==
-can't open device TEST_DIR/simple-pattern.cloop: offsets not monotonically increasing at index 1, image file is corrupt
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: offsets not monotonically increasing at index 1, image file is corrupt
 
 == refuse images with invalid compressed block size ==
-can't open device TEST_DIR/simple-pattern.cloop: invalid compressed block size at index 1, image file is corrupt
+qemu-io: can't open device TEST_DIR/simple-pattern.cloop: invalid compressed block size at index 1, image file is corrupt
 *** done