[PATCH v2 09/24] dyndbg: add maybe(str,"") macro to reduce code

[Jim Cromie]

reduce word count via macro, no actual object change.

OTOH, maybe() could be scrubbed if printk's default printing (iirc) of
"(null)" pointers is deemed appropriate for the log-msg.
---
 lib/dynamic_debug.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 31d3be30776e..20b712652ee4 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -114,6 +114,7 @@ do {								\
 #define vpr_info(fmt, ...)	vnpr_info(1, fmt, ##__VA_ARGS__)
 #define v2pr_info(fmt, ...)	vnpr_info(2, fmt, ##__VA_ARGS__)
 
+#define maybe(str, empty)	( str ? str : empty )
 static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
 {
 	/* trim any trailing newlines */
@@ -127,10 +128,10 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
 
 	vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
 		 msg,
-		 query->function ? query->function : "",
-		 query->filename ? query->filename : "",
-		 query->module ? query->module : "",
-		 fmtlen, query->format ? query->format : "",
+		 maybe(query->function, ""),
+		 maybe(query->filename, ""),
+		 maybe(query->module, ""),
+		 fmtlen, maybe(query->format, ""),
 		 query->first_lineno, query->last_lineno);
 }
 
-- 
2.26.2