pstopre: fix return value of list_files()

Previously, the return value of the last read_full_file() is returned.
This makes the error in read_full_file() is always ignored.

src/pstore/pstore.c

@@ -314,7 +314,7 @@ static void process_dmesg_files(PStoreList *list) {
 static int list_files(PStoreList *list, const char *sourcepath) {
         _cleanup_(closedirp) DIR *dirp = NULL;
         struct dirent *de;
-        int r = 0;
+        int r;
 
         dirp = opendir(sourcepath);
         if (!dirp)
@@ -333,7 +333,7 @@ static int list_files(PStoreList *list, const char *sourcepath) {
                 /* Now read contents of pstore file */
                 r = read_full_file(ifd_path, &buf, &buf_size);
                 if (r < 0) {
-                        log_warning_errno(r, "Failed to read file %s: %m", ifd_path);
+                        log_warning_errno(r, "Failed to read file %s, skipping: %m", ifd_path);
                         continue;
                 }
 
@@ -349,7 +349,7 @@ static int list_files(PStoreList *list, const char *sourcepath) {
                 };
         }
 
-        return r;
+        return 0;
 }
 
 static int run(int argc, char *argv[]) {