Add missing noreturn attribute to various functions

Signed-off-by: Thomas Wood <thomas.wood@intel.com>

debugger/eudb.c

@@ -326,7 +326,7 @@ db_shutdown(int sig) {
 	printf("Shutting down...\n");
 }
 
-static void
+static void __attribute__((noreturn))
 die(int reason) {
 	int i = 0;
 

lib/igt_core.c

@@ -1750,7 +1750,7 @@ out:
 }
 
 static const char *timeout_op;
-static void igt_alarm_handler(int signal)
+static void __attribute__((noreturn)) igt_alarm_handler(int signal)
 {
 	if (timeout_op)
 		igt_info("Timed out: %s\n", timeout_op);

tests/gem_madvise.c

@@ -49,7 +49,7 @@ IGT_TEST_DESCRIPTION("Checks that the kernel reports EFAULT when trying to use"
 
 static jmp_buf jmp;
 
-static void sigtrap(int sig)
+static void __attribute__((noreturn)) sigtrap(int sig)
 {
 	longjmp(jmp, sig);
 }

tests/pm_rpm.c

@@ -1386,7 +1386,7 @@ static void pci_d3_state_subtest(void)
 	igt_assert(!device_in_pci_d3());
 }
 
-static void stay_subtest(void)
+static void __attribute__((noreturn)) stay_subtest(void)
 {
 	disable_all_screens_and_wait(&ms_data);
 

tests/testdisplay.c

@@ -552,7 +552,7 @@ static void __attribute__((noreturn)) usage(char *name, char opt)
 
 #define dump_resource(res) if (res) dump_##res()
 
-static void cleanup_and_exit(int ret)
+static void __attribute__((noreturn)) cleanup_and_exit(int ret)
 {
 	close(drm_fd);
 	exit(ret);

tools/intel_display_poller.c

@@ -946,7 +946,7 @@ static const char *test_name(enum test test, int pipe, int bit, bool test_pixel_
 	}
 }
 
-static void usage(const char *name)
+static void __attribute__((noreturn)) usage(const char *name)
 {
 	fprintf(stderr, "Usage: %s [options]\n"
 		" -t,--test <pipestat|iir|framecount|flipcount|pan|flip|surflive|wrap|field>\n"

tools/intel_gpu_frequency.c

@@ -142,7 +142,7 @@ static int get_frequency(struct freq_info *freq_info)
 	return val;
 }
 
-static void
+static void __attribute__((noreturn))
 usage(const char *prog)
 {
 	printf("%s A program to manipulate Intel GPU frequencies.\n\n", prog);