Give the Coverity scanner some more GCC blinders...

Coverity complains:

  CID 373676 (rhboot#3 of 3): Unrecoverable parse warning (PARSE_ERROR)
  1. arguments_provided_for_attribute: attribute "__malloc__" does not take arguments

This is, of course, just plain wrong.  Even so, I'm tired of looking at
it, so this patch wraps the #define we use for that attribute in a check
to see if it's being built by Coverity.

Signed-off-by: Peter Jones <pjones@redhat.com>

include/compiler.h

@@ -47,8 +47,12 @@
 #define ALIAS(x) __attribute__((weak, alias (#x)))
 #endif
 #ifndef ALLOCFUNC
+#if defined(__COVERITY__)
+#define ALLOCFUNC(a, b)
+#else
 #define ALLOCFUNC(dealloc, dealloc_arg) __attribute__((__malloc__(dealloc, dealloc_arg)))
 #endif
+#endif
 #ifndef PRINTF
 #define PRINTF(first, args...) __attribute__((__format__(printf, first, ## args)))
 #endif