libsparse: Fix odd-sized input files total_blks

If the input file isn't a multiple of block_size, count the trailing
bit as a block in the output, otherwise bootloader will try to write
past the last declared block in the sparse file.

Test: Run sparse_test
Bug: 37339998
Change-Id: Iec143107d15795c6a6f4d3ea7b7515f6f16adcae

libsparse/output_file.c

@@ -584,7 +584,7 @@ static int output_file_init(struct output_file *out, int block_size,
 				.file_hdr_sz = SPARSE_HEADER_LEN,
 				.chunk_hdr_sz = CHUNK_HEADER_LEN,
 				.blk_sz = out->block_size,
-				.total_blks = out->len / out->block_size,
+				.total_blks = DIV_ROUND_UP(out->len, out->block_size),
 				.total_chunks = chunks,
 				.image_checksum = 0
 		};