Declare internal function usage() as static

examples/mifare-classic-format.c

@@ -125,7 +125,7 @@ try_format_sector (MifareTag tag, MifareClassicSectorNumber sector)
     return 0;
 }
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s [-fy]\n", progname);

examples/mifare-classic-read-ndef.c

@@ -53,7 +53,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s -o FILE\n", progname);

examples/mifare-classic-write-ndef.c

@@ -116,7 +116,7 @@ fix_mad_trailer_block (nfc_device *device, MifareTag tag, MifareClassicSectorNum
     return 0;
 }
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s -i FILE\n", progname);

examples/mifare-desfire-create-ndef.c

@@ -47,7 +47,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "This application turns Mifare DESFire targets into NFC Forum Type 4 Tags.\n");

examples/mifare-desfire-ev1-configure-ats.c

@@ -41,7 +41,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s [-y] [-K 11223344AABBCCDD]\n", progname);

examples/mifare-desfire-ev1-configure-default-key.c

@@ -40,7 +40,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s [-y]\n", progname);

examples/mifare-desfire-ev1-configure-random-uid.c

@@ -37,7 +37,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s [-y] [-K 11223344AABBCCDD]\n", progname);

examples/mifare-desfire-format.c

@@ -37,7 +37,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "usage: %s [-y] [-K 11223344AABBCCDD]\n", progname);

examples/mifare-desfire-read-ndef.c

@@ -51,7 +51,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "This application reads a NDEF payload from a Mifare DESFire formatted as NFC Forum Type 4 Tag.\n");

examples/mifare-desfire-write-ndef.c

@@ -59,7 +59,7 @@ struct {
     .interactive = true
 };
 
-void
+static void
 usage(char *progname)
 {
     fprintf (stderr, "This application writes a NDEF payload into a Mifare DESFire formatted as NFC Forum Type 4 Tag.\n");