tests: Reformat assert-msg-test.c to follow coding style

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

glib/tests/assert-msg-test.c

@@ -1,7 +1,10 @@
 #include <glib.h>
 
-int main(int argc, char **argv)
+int
+main (int    argc,
+      char **argv)
 {
-    g_assert(42 < 0);
+
+  g_assert (42 < 0);
   return 0;
 }