[Patch] btrfs-image.c: fix return values

[Américo Wang]

- Exit with non-zero when fail;
- Don't exit in non-main functions, return.

Signed-off-by: WANG Cong <wangc...@zeuux.org>

---
diff --git a/btrfs-image.c b/btrfs-image.c
index 9925bdb..62b3dd8 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -741,7 +741,7 @@ static int restore_metadump(const char *input, FILE *out, 
int num_threads)
                in = fopen(input, "r");
                if (!in) {
                        perror("unable to open metadump image");
-                       exit(1);
+                       return 1;
                }
        }
 
@@ -760,7 +760,7 @@ static int restore_metadump(const char *input, FILE *out, 
int num_threads)
                if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
                    le64_to_cpu(header->bytenr) != bytenr) {
                        fprintf(stderr, "bad header in metadump image\n");
-                       exit(1);
+                       return 1;
                }
                ret = add_cluster(cluster, &mdrestore, &bytenr);
                BUG_ON(ret);
@@ -850,5 +850,5 @@ int main(int argc, char *argv[])
        else
                fclose(out);
 
-       exit(0);
+       exit(ret);
 }


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