Revert "use stat to get file size"

This reverts commit 1ea37d8.

canfigger.c

@@ -19,7 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <ctype.h>              // isspace()
 #include <errno.h>
-#include <sys/stat.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>             // free(), malloc()
@@ -280,15 +279,8 @@ read_entire_file(const char *filename)
     return NULL;
   }
 
-  //fseek(fp, 0, SEEK_END);
-  //long file_size = ftell(fp);
-  long file_size = -1;
-  struct stat st;
-  if (stat(filename, &st) == 0)
-    file_size = st.st_size;
-  else
-    perror("stat failed");
-
+  fseek(fp, 0, SEEK_END);
+  long file_size = ftell(fp);
   if (file_size < 0)
   {
     fprintf(stderr, "Error getting the size of %s: %s\n", filename,