util: qemu: use VIR_AUTOPTR for aggregate types

By making use of GNU C's cleanup attribute handled by the
VIR_AUTOPTR macro for declaring aggregate pointer variables,
majority of the calls to *Free functions can be dropped, which
in turn leads to getting rid of most of our cleanup sections.
Signed-off-by: NSukrit Bhatnagar <skrtbhtngr@gmail.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

src/util/virqemu.c

@@ -56,7 +56,7 @@ virQEMUBuildCommandLineJSONArrayBitmap(const char *key,
 {
     ssize_t pos = -1;
     ssize_t end;
-    virBitmapPtr bitmap = NULL;
+    VIR_AUTOPTR(virBitmap) bitmap = NULL;
 
     if (virJSONValueGetArrayAsBitmap(array, &bitmap) < 0)
         return -1;
@@ -73,8 +73,6 @@ virQEMUBuildCommandLineJSONArrayBitmap(const char *key,
         }
     }
 
-    virBitmapFree(bitmap);
-
     return 0;
 }