This patch fixes the parsing of the display timings options if
the range is specified (min/typ/max). Also fixed the double
release of memory in case of failure.

barebox 2018.12.0-00341-g23b28d33a-dirty #6 Fri Mar 15 09:20:25 MSK 2019

Board: Mega-Milas Informer i.MX6
detected i.MX6 Quad revision 1.2
i.MX reset reason POR (SRSR: 0x00000001)
mdio_bus: miibus0: probed
eth0: got preset MAC address: 50:2d:f4:07:71:0b
nand: NAND device: Manufacturer ID: 0xec, Chip ID: 0xd3 (Samsung NAND 1GiB 3,3V 8-bit), 1024MiB, page size: 2048, OOB size: 64
Bad block table found at page 524224, version 0x01
Bad block table found at page 524160, version 0x01
m25p80 flash@00: n25q128a13 (16384 Kbytes)
imx-usb 2184000.usb@2184000: USB EHCI 1.00
imx-usb 2184200.usb@2184200: USB EHCI 1.00
imx-esdhc 2198000.usdhc@2198000: registered as mmc2
imx-ipuv3 2400000.ipu@2400000: IPUv3H probed
ERROR: /ldb/lvds-channel@0/display-timings/PH320240T: illegal timing specification in clock-frequency
ERROR: /ldb/lvds-channel@0/display-timings/PH320240T: error reading timing properties
ERROR: /ldb/lvds-channel@0: error in timing 1
ERROR: unable to handle NULL pointer dereference at address 0x00000013
pc : [<4fe05742>]    lr : [<4fe05849>]
sp : 4ffefa80  ip : ffffffff  fp : 2fefe84c
r10: 2ff656e8  r9 : 0000002c  r8 : 2ff19630
r7 : 00000000  r6 : 0000004c  r5 : 2ff65960  r4 : 00000007
r3 : 00000013  r2 : 00000000  r1 : 4fe87584  r0 : 2fefb460
Flags: nzcv  IRQs off  FIQs off  Mode SVC_32
[<4fe05742>] (remove_free_block+0xe/0x3e) from [<4fe05849>] (block_locate_free+0x7f/0x88)
[<4fe05849>] (block_locate_free+0x7f/0x88) from [<4fe0599b>] (tlsf_malloc+0x17/0x32)
[<4fe0599b>] (tlsf_malloc+0x17/0x32) from [<4fe0559b>] (malloc+0x13/0x24)
[<4fe0559b>] (malloc+0x13/0x24) from [<4fe3a1f3>] (strdup+0x11/0x22)
[<4fe3a1f3>] (strdup+0x11/0x22) from [<4fe006f3>] (pr_puts+0x33/0x84)
[<4fe006f3>] (pr_puts+0x33/0x84) from [<4fe00803>] (dev_printf+0x6f/0x8c)
[<4fe00803>] (dev_printf+0x6f/0x8c) from [<00000000>] (0x0)

[<4fe54715>] (unwind_backtrace+0x1/0x60) from [<4fe00de1>] (panic+0x1d/0x34)
[<4fe00de1>] (panic+0x1d/0x34) from [<4fe5285d>] (do_exception+0xd/0x10)
[<4fe5285d>] (do_exception+0xd/0x10) from [<4fe528bd>] (do_data_abort+0x21/0x2c)
[<4fe528bd>] (do_data_abort+0x21/0x2c) from [<4fe524d4>] (do_abort_6+0x48/0x54)
 ### ERROR ### Please RESET the board ###

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>