ftpd: Simplify console_fs_error logic

programs/network/ftpd/commands.inc

@@ -337,6 +337,7 @@ align 4
 fs_err_table:
         dd str_fs_error2      ; 2
         dd str_fs_error3      ; 3
+        dd str_fs_error       ; 4
         dd str_fs_error5      ; 5
         dd str_fs_error6      ; 6
         dd str_fs_error7      ; 7
@@ -347,23 +348,19 @@ fs_err_table:
         dd str_fs_error12     ; 12
 
 console_fs_error:
-        cmp     eax, 2
-        jb      .out_of_range
-        cmp     eax, 12
-        ja      .out_of_range
-        cmp     eax, 4
-        ja      .after4
-        sub     eax, 2
-        jmp     .index_ok
-.after4:
-        sub     eax, 3
-.index_ok:
-        mov     edx, [fs_err_table + eax*4]
-        invoke  con_write_asciiz, edx
-        ret
+        mov     edx, 4 ;  Unknown filesystem error
 
-.out_of_range:
-        invoke  con_write_asciiz, str_fs_error
+        cmp     eax, 2
+        jb      .print_err
+        cmp     eax, 12
+        ja      .print_err
+
+        mov     edx, eax
+
+.print_err:
+        sub     edx, 2
+        mov     edx, [fs_err_table + edx*4]
+        invoke  con_write_asciiz, edx
         ret
 
 ;------------------------------------------------