tracing: typecast sizeof and offsetof to unsigned int

Impact: fix compiler warnings

On x86_64 sizeof and offsetof are treated as long, where as on x86_32
they are int. This patch typecasts them to unsigned int to avoid
one arch giving warnings while the other does not.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>

kernel/trace/trace_export.c

@@ -18,11 +18,11 @@
 #include "trace_format.h"
 
 #undef TRACE_FIELD_ZERO_CHAR
-#define TRACE_FIELD_ZERO_CHAR(item)				\
-	ret = trace_seq_printf(s, "\tfield: char " #item ";\t"	\
-			       "offset:%lu;\tsize:0;\n",	\
-			       offsetof(typeof(field), item));	\
-	if (!ret)						\
+#define TRACE_FIELD_ZERO_CHAR(item)					\
+	ret = trace_seq_printf(s, "\tfield: char " #item ";\t"		\
+			       "offset:%u;\tsize:0;\n",			\
+			       (unsigned int)offsetof(typeof(field), item)); \
+	if (!ret)							\
 		return 0;