Add clang-format configuration, clean up

tests/06buffer.c

@@ -2,7 +2,8 @@
 #include "../termo.h"
 #include "taplib.h"
 
-int main (int argc, char *argv[])
+int
+main (int argc, char *argv[])
 {
 	termo_t *tk;
 	termo_key_t key;

tests/31position.c

@@ -1,7 +1,8 @@
 #include "../termo.h"
 #include "taplib.h"
 
-int main (int argc, char *argv[])
+int
+main (int argc, char *argv[])
 {
 	termo_t *tk;
 	termo_key_t key;

tests/taplib.c

@@ -73,7 +73,7 @@ is_str (const char *got, const char *expect, char *name)
 }
 
 int
-exit_status(void)
+exit_status (void)
 {
 	return g_exit_status;
 }