Stop searching in further dirs on errors except ENOENT #12

if a terminfo file was found during the directory search, loaded, and then found to contain an error, the search continues into other locations. If this eventually fails, the error is always ENOENT, thus swallowing the reason that the file which was found, had errored.

This PR changes the behaviour, stopping on the first error that is not ENOENT.

ref: mauke#41

uniutil.c

@@ -162,7 +162,7 @@ static unibi_term *from_dirs(const char *list, const char *term) {
         z = strchr(a, ':');
 
         ut = from_dir(a, z, NULL, term);
-        if (ut) {
+        if (ut || errno != ENOENT) {
             return ut;
         }
 
@@ -196,7 +196,7 @@ unibi_term *unibi_from_term(const char *term) {
 
     if ((env = getenv("HOME"))) {
         ut = from_dir(env, NULL, ".terminfo", term);
-        if (ut) {
+        if (ut || errno != ENOENT) {
             return ut;
         }
     }