ext4: avoid calling ext4fs_mount() twice, which leaks

ext4_write_file() is only called from the "fs" layer, which calls both
ext4fs_mount() and ext4fs_close() before/after calling ext4_write_file().
Fix ext4_write_file() not to call ext4fs_mount() again, since the mount
operation malloc()s some RAM which is leaked when a second mount call
over-writes the pointer to that data, if no intervening close call is
made.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>

fs/ext4/ext4_write.c

@@ -987,26 +987,17 @@ int ext4_write_file(const char *filename, void *buf, loff_t offset,
 		return -1;
 	}
 
-	/* mount the filesystem */
-	if (!ext4fs_mount(0)) {
-		printf("** Error Bad ext4 partition **\n");
-		goto fail;
-	}
-
 	ret = ext4fs_write(filename, buf, len);
-
 	if (ret) {
 		printf("** Error ext4fs_write() **\n");
 		goto fail;
 	}
-	ext4fs_close();
 
 	*actwrite = len;
 
 	return 0;
 
 fail:
-	ext4fs_close();
 	*actwrite = 0;
 
 	return -1;