maint: formatting cleanups in buf.c

* src/util/buf.c: Use consistent formatting.

src/util/buf.c

@@ -458,7 +458,7 @@ virBufferEscapeSexpr(virBufferPtr buf,
     virBufferEscape(buf, '\\', "\\'", format, str);
 }
 
-/* Work around spurious strchr() diagnostics given by -Wlogical-op *
+/* Work around spurious strchr() diagnostics given by -Wlogical-op
  * for gcc < 4.6.  Doing it via a local pragma keeps the damage
  * smaller than disabling it on the package level.  Unfortunately, the
  * affected GCCs don't allow diagnostic push/pop which would have