TW-1741: Warning "ignoring return value of ‘int ftruncate" while doing make on xubuntu15.10

- Thanks to Sunil Joshi.

src/FS.cpp

@@ -36,6 +36,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <dirent.h>
+#include <errno.h>
 #include <string.h>
 #include <text.h>
 #include <util.h>
@@ -556,7 +557,8 @@ void File::truncate ()
     open ();
 
   if (_fh)
-    (void) ftruncate (_h, 0);
+    if (ftruncate (_h, 0))
+      throw format (STRING_FILE_TRUNCATE, errno, strerror (errno));
 }
 
 ////////////////////////////////////////////////////////////////////////////////

src/l10n/deu-DEU.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior hat die erforderlichen Rechte auf '{1}' nicht."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/eng-USA.h

@@ -794,6 +794,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior does not have the correct permissions for '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/epo-RUS.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior ne havas la bezonatan permeson por '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/esp-ESP.h

@@ -804,6 +804,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior no tiene los permisos adecuados para '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "El proyecto '{1}' ha cambiado."

src/l10n/fra-FRA.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior does not have the correct permissions for '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/ita-ITA.h

@@ -795,6 +795,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior non dispone dei permessi corretti per '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "Il progetto '{1}' è stato modificat."

src/l10n/jpn-JPN.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior does not have the correct permissions for '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/pol-POL.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "Taskwarrior nie posiada praw dostępu do '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."

src/l10n/por-PRT.h

@@ -796,6 +796,7 @@
 
 // File
 #define STRING_FILE_PERMS            "O taskwarrior não encontrou as permissões corretas em '{1}'."
+#define STRING_FILE_TRUNCATE         "Could not truncate file: {1} {2}"
 
 // helpers
 #define STRING_HELPER_PROJECT_CHANGE "The project '{1}' has changed."