Factorize error messages

src/fmail.c

@@ -458,16 +458,12 @@ read_input_from_editor(void)
     int fd;
     FILE *f;
 
-    if ( asprintf(&filename, "%s/fmailXXXXXX", get_tmp_dir()) == -1 )
+    if ( asprintf(&filename, "%s/fmailXXXXXX", get_tmp_dir()) == -1
+            || (fd = mkstemp(filename)) == -1 )
         err(EXIT_FAILURE, "cannot create temporary file");
 
-    if ( (fd = mkstemp(filename)) == -1 )
-        err(EXIT_FAILURE, "cannot create temporary file");
-
-    if ( asprintf(&command, "%s %s", get_editor(), filename) == -1 )
-        err(EXIT_FAILURE, "cannot execute editor");
-
-    if ( system(command) == -1 )
+    if ( asprintf(&command, "%s %s", get_editor(), filename) == -1
+            || system(command) == -1 )
         err(EXIT_FAILURE, "cannot execute editor");
 
     if ( (f = fdopen(fd, "r")) == NULL )