Kinetis: properly pad flash section writes

kinetis_write() with byte count not divisible by prog_section_chunk_bytes
computed wrong wc and therefore paded section chunk by some
random data instead of 0xff

Change-Id: Ic7c66d8a3ceacda9e611e98b9fbf943b8001774b
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/2994
Tested-by: jenkins
Reviewed-by: Thomas Schmid <thomas@rfranging.com>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

src/flash/nor/kinetis.c

@@ -1054,7 +1054,7 @@ static int kinetis_write(struct flash_bank *bank, const uint8_t *buffer,
 				unsigned residual_bc = (count-i) % prog_section_chunk_bytes;
 
 				/* number of complete words to copy directly from buffer */
-				wc = (count - i) / 4;
+				wc = (count - i - residual_bc) / 4;
 
 				/* number of total sections to write, including residual */
 				section_count = DIV_ROUND_UP((count-i), prog_section_chunk_bytes);