Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
lttng-ust-2.14.0/src/common/ringbuffer/ring_buffer_backend.c:580:19: warning[-Wanalyzer-null-dereference]: dereference of NULL '0'
#  578|   		return NULL;
#  579|   	config = &chanb->config;
#  580|-> 	offset &= chanb->buf_size - 1;
#  581|   	sbidx = offset >> chanb->subbuf_size_order;
#  582|   	sb = shmp_index(handle, bufb->buf_wsb, sbidx);

Error: COMPILER_WARNING (CWE-563): [#def2]
lttng-ust-2.14.0/src/lib/lttng-ust-ctl/ustctl.c: scope_hint: In function 'lttng_ust_ctl_get_mmap_base'
lttng-ust-2.14.0/src/lib/lttng-ust-ctl/ustctl.c:117:17: warning[-Wunused-value]: statement with no effect
#  117 |                 true; \
#      |                 ^~~~
lttng-ust-2.14.0/src/lib/lttng-ust-ctl/ustctl.c:1762:13: note: in expansion of macro 'sigbus_begin'
# 1762 |         if (sigbus_begin())
#      |             ^~~~~~~~~~~~
#  115|   		/* SIGBUS. */ \
#  116|   		CMM_STORE_SHARED(lttng_ust_sigbus_state.jmp_ready, 0); \
#  117|-> 		true; \
#  118|   	} \
#  119|   	cmm_barrier(); \

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