tweaks: rename a type, to better fit the general pattern

src/files.c

@@ -1029,7 +1029,7 @@ void do_insertfile(void)
 	char *given = mallocstrcpy(NULL, "");
 		/* The last answer the user typed at the statusbar prompt. */
 #ifndef NANO_TINY
-	file_format original_fmt = openfile->fmt;
+	format_type was_fmt = openfile->fmt;
 	bool execute = FALSE;
 #endif
 
@@ -1197,7 +1197,7 @@ void do_insertfile(void)
 					set_modified();
 #ifndef NANO_TINY
 				/* Ensure that the buffer retains the format that it had. */
-				openfile->fmt = original_fmt;
+				openfile->fmt = was_fmt;
 #endif
 				refresh_needed = TRUE;
 			}

src/nano.h

@@ -147,7 +147,7 @@
 /* Enumeration types. */
 typedef enum {
 	NIX_FILE, DOS_FILE, MAC_FILE
-} file_format;
+} format_type;
 
 typedef enum {
 	HUSH, NOTICE, MILD, ALERT
@@ -381,7 +381,7 @@ typedef struct openfilestruct {
 		/* The mark's x position in the above line. */
 	mark_type kind_of_mark;
 		/* Whether it is a soft (with Shift) or a hard mark. */
-	file_format fmt;
+	format_type fmt;
 		/* The file's format -- Unix or DOS or Mac or mixed. */
 	undo *undotop;
 		/* The top of the undo list. */