Move usage text into usage_str var

For consistency and readability.

Note: This also makes exactly one extra blank line be printed at the end
of every usage text, which is currently only done in the following
files:

* src/fcopy/main.c
* src/fnettrace-dns/main.c
* src/fnettrace-icmp/main.c
* src/fnettrace-sni/main.c
* src/fnettrace/main.c
* src/profstats/main.c

1 files changed, 3 insertions, 2 deletions

diff --git a/src/fids/main.c b/src/fids/main.c
index f1dfdac8e..915edb6ca 100644
--- a/src/fids/main.c
+++ b/src/fids/main.c
@@ -318,10 +318,11 @@ static void process_config(const char *fname) {
         include_level--;
 }
 
-
+static const char *const usage_str =
+        "Usage: fids [--help|-h|-?] --init|--check homedir\n";
 
 void usage(void) {
-        printf("Usage: fids [--help|-h|-?] --init|--check homedir\n");
+        puts(usage_str);
 }
 
 int main(int argc, char **argv) {