Fixed findings

List of Findings

Error: CPPCHECK_WARNING (CWE-476): [#def1]
libwacom-2.18.0/libwacom/libwacom-error.c:41: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: error
#   39|   {
#   40|   	WacomError *error = malloc(sizeof(*error));
#   41|-> 	error->code = WERROR_NONE;
#   42|   	error->msg = NULL;
#   43|   	return error;

Error: GCC_ANALYZER_WARNING (CWE-476): [#def2]
libwacom-2.18.0/libwacom/libwacom-error.c:41:9: warning[-Wanalyzer-possible-null-dereference]: dereference of possibly-NULL ‘error’
libwacom-2.18.0/libwacom/libwacom-error.c:40:29: acquire_memory: this call could return NULL
libwacom-2.18.0/libwacom/libwacom-error.c:41:9: danger: ‘error’ could be NULL: unchecked value from [(1)](sarif:/runs/0/results/0/codeFlows/0/threadFlows/0/locations/0)
#   39|   {
#   40|   	WacomError *error = malloc(sizeof(*error));
#   41|-> 	error->code = WERROR_NONE;
#   42|   	error->msg = NULL;
#   43|   	return error;

Error: CPPCHECK_WARNING (CWE-476): [#def3]
libwacom-2.18.0/libwacom/libwacom-error.c:42: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: error
#   40|   	WacomError *error = malloc(sizeof(*error));
#   41|   	error->code = WERROR_NONE;
#   42|-> 	error->msg = NULL;
#   43|   	return error;
#   44|   }

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