examples/utils: add nfc_exit() to signal traps

and one missing nfc_abort_command()

examples/nfc-dep-initiator.c

@@ -53,10 +53,12 @@ static nfc_device *pnd;
 static void stop_dep_communication(int sig)
 {
   (void) sig;
-  if (pnd != NULL)
+  if (pnd != NULL) {
     nfc_abort_command(pnd);
-  else
+  } else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
+  }
 }
 
 int

examples/nfc-dep-target.c

@@ -52,10 +52,12 @@ static nfc_device *pnd;
 static void stop_dep_communication(int sig)
 {
   (void) sig;
-  if (pnd != NULL)
+  if (pnd != NULL) {
     nfc_abort_command(pnd);
-  else
+  } else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
+  }
 }
 
 int

examples/nfc-emulate-forum-tag2.c

@@ -82,6 +82,7 @@ stop_emulation(int sig)
   if (pnd != NULL) {
     nfc_abort_command(pnd);
   } else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
   }
 }

examples/nfc-emulate-tag.c

@@ -66,6 +66,9 @@ intr_hdlr(int sig)
 {
   (void) sig;
   printf("\nQuitting...\n");
+  if (pnd != NULL) {
+    nfc_abort_command(pnd);
+  }
   nfc_close(pnd);
   nfc_exit(context);
   exit(EXIT_FAILURE);

examples/nfc-poll.c

@@ -58,8 +58,10 @@ static void stop_polling(int sig)
   (void) sig;
   if (pnd != NULL)
     nfc_abort_command(pnd);
-  else
+  else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
+  }
 }
 
 static void

utils/nfc-emulate-forum-tag4.c

@@ -237,10 +237,12 @@ nfcforum_tag4_io(struct nfc_emulator *emulator, const uint8_t *data_in, const si
 static void stop_emulation(int sig)
 {
   (void) sig;
-  if (pnd != NULL)
+  if (pnd != NULL) {
     nfc_abort_command(pnd);
-  else
+  } else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
+  }
 }
 
 static int

utils/nfc-read-forum-tag3.c

@@ -72,10 +72,12 @@ print_usage(char *progname)
 static void stop_select(int sig)
 {
   (void) sig;
-  if (pnd != NULL)
+  if (pnd != NULL) {
     nfc_abort_command(pnd);
-  else
+  } else {
+    nfc_exit(context);
     exit(EXIT_FAILURE);
+  }
 }
 
 static void