tests: print error locations verbosely

So we don't have to figure out which line generated this error by
searching for the subtest/error code combination.

Change-Id: Icca0a776fd19f0f3d250ddb76916f5f932dd9b5e

test/test22.c

@@ -21,7 +21,6 @@
 void test22a(void);
 int mode(char *filename);
 int umode(char *filename);
-void e(int number);
 void quit(void);
 
 int main(int argc, char *argv[])