Mark usage, fatal, and panic as _X_NORETURN

xrandr.c:634:13: warning: Access to field 'next' results in a dereference of a null pointer (loaded from variable 'output')
    output->next = NULL;
    ~~~~~~  ^
xrandr.c:1214:6: warning: Access to field 'mode' results in a dereference of a null pointer (loaded from variable 'crtc_info')
        if (crtc_info->mode == None)
            ^~~~~~~~~
xrandr.c:1252:5: warning: Array access (via field 'outputs') results in a null pointer dereference
    crtc->outputs[crtc->noutput++] = output;
    ^     ~~~~~~~
xrandr.c:1638:33: warning: Access to field 'name' results in a dereference of a null pointer (loaded from variable 'output_info')
        set_name_string (&output_name, output_info->name);
                                       ^~~~~~~~~~~
xrandr.c:1725:10: warning: Access to field 'changes' results in a dereference of a null pointer (loaded from variable 'output')
            if (output->changes)
                ^~~~~~
xrandr.c:1848:10: warning: Access to field 'mode_info' results in a dereference of a null pointer (loaded from variable 'relation')
            if (relation->mode_info == NULL)
                ^~~~~~~~
xrandr.c:3194:11: warning: Array access (from variable 'mode_shown') results in a null pointer dereference
                    if (mode_shown[j]) continue;
                        ^~~~~~~~~~

Found-by: clang static analyzer
Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/configure.ac b/configure.ac
index e4359a2..a729fc5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_CHECK_LIB(m,floor)
 
 # Checks for pkg-config packages
-PKG_CHECK_MODULES(XRANDR, xrandr >= 1.3 xrender x11)
+PKG_CHECK_MODULES(XRANDR, xrandr >= 1.3 xrender x11 xproto >= 7.0.17)
 
 AC_CONFIG_FILES([
 	Makefile
diff --git a/xrandr.c b/xrandr.c
index 558fa45..d03d3a2 100644
--- a/xrandr.c
+++ b/xrandr.c
@@ -88,7 +88,7 @@ static const struct {
     { NULL,	    0 }
 };
 
-static void
+static void _X_NORETURN
 usage(void)
 {
     fprintf(stderr, "usage: %s [options]\n", program_name);
@@ -146,7 +146,7 @@ usage(void)
     /*NOTREACHED*/
 }
 
-static void
+static void _X_NORETURN
 fatal (const char *format, ...)
 {
     va_list ap;
@@ -1509,7 +1509,7 @@ revert (void)
  * the configuration. Revert to the previous configuration
  * and bail
  */
-static void
+static void _X_NORETURN
 panic (Status s, crtc_t *crtc)
 {
     int	    c = crtc->crtc.index;