Fixed segfault when launched on a nonexistant directory

Forgot to check the return value of path_absolute() in path_real(),
path_absolute() would return an error when getcwd() fails.

Fixes bug #3012787.

ChangeLog

@@ -3,6 +3,7 @@ git - ?
 	- Count the size of a hard linked file once for each directory it appears in
 	- Fixed crash on browsing dirs with a small window size (#2991787)
 	- Fixed buffer overflow when some directories can't be scanned (#2981704)
+	- Fixed segfault when launched on a nonexistant directory (#3012787)
 	- Fixed segfault when root dir only contains hidden files
 	- Improved browsing performance
 	- More intuitive multi-page browsing

src/path.c

@@ -201,7 +201,8 @@ char *path_real(const char *orig) {
   if(orig == NULL)
     return NULL;
 
-  tmp = path_absolute(orig);
+  if((tmp = path_absolute(orig)) == NULL)
+    return NULL;
   ret = path_real_rec(tmp, &links);
   free(tmp);
   return ret;