net: wwan: t7xx: do not compile with -Werror

When playing with various compilers or their versions, some choke on
the t7xx code. For example (with gcc 13):
 In file included from ./arch/s390/include/generated/asm/rwonce.h:1,
                  from ../include/linux/compiler.h:247,
                  from ../include/linux/build_bug.h:5,
                  from ../include/linux/bits.h:22,
                  from ../drivers/net/wwan/t7xx/t7xx_state_monitor.c:17:
 In function 'preempt_count',
     inlined from 't7xx_fsm_append_event' at ../drivers/net/wwan/t7xx/t7xx_state_monitor.c:439:43:
 ../include/asm-generic/rwonce.h:44:26: error: array subscript 0 is outside array bounds of 'const volatile int[0]' [-Werror=array-bounds=]

There is no reason for any code in the kernel to be built with -Werror
by default. Note that we have generic CONFIG_WERROR. So if anyone wants
-Werror, they can enable that.

Signed-off-by: Jiri Slaby (SUSE) <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Cc: Chandrashekar Devegowda <[email protected]>
Cc: Intel Corporation <[email protected]>
Cc: Chiranjeevi Rapolu <[email protected]>
Cc: Liu Haijun <[email protected]>
Cc: M Chetan Kumar <[email protected]>
Cc: Ricardo Martinez <[email protected]>
Cc: Loic Poulain <[email protected]>
Cc: Sergey Ryazanov <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>

Author: Jiri Slaby (SUSE)

drivers/net/wwan/t7xx/Makefile

@@ -1,7 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-ccflags-y += -Werror
-
 obj-${CONFIG_MTK_T7XX} := mtk_t7xx.o
 mtk_t7xx-y:=	t7xx_pci.o \
 		t7xx_pcie_mac.o \