tracetool: also strip %l and %ll from systemtap format strings

All variables are 64-bit and so %l / %ll are not required, and the
latter is actually invalid:

  $ sudo stap -e 'probe begin{printf ("BEGIN")}'  -I .
  parse error: invalid or missing conversion specifier
          saw: operator ',' at ./qemu-system-x86_64-log.stp:15118:101
       source:     printf("%d@%d vhost_vdpa_set_log_base dev: %p base: 0x%x size: %llu
refcnt: %d fd: %d log: %p\n", pid(), gettimeofday_ns(), dev, base, size, refcnt, fd, log)

                       ^

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Message-id: 20210106130239.1004729-1-berrange@redhat.com

[Fixed "simiarly" typo found by Laurent Vivier <lvivier@redhat.com>
--Stefan]

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

scripts/tracetool/format/log_stap.py

@@ -78,7 +78,12 @@ def c_fmt_to_stap(fmt):
     elif state == STATE_LITERAL:
         bits.append(literal)
 
-    fmt = re.sub("%(\d*)z(x|u|d)", "%\\1\\2", "".join(bits))
+    # All variables in systemtap are 64-bit in size
+    # The "%l" integer size qualifier is thus redundant
+    # and "%ll" is not valid at all. Similarly the size_t
+    # based "%z" size qualifier is not valid. We just
+    # strip all size qualifiers for sanity.
+    fmt = re.sub("%(\d*)(l+|z)(x|u|d)", "%\\1\\3", "".join(bits))
     return fmt
 
 def generate(events, backend, group):