patch 8.2.4043: using int for second argument of ga_init2()

Problem:    Using int for second argument of ga_init2().
Solution:   Remove unnessary type cast (int) when using sizeof().
diff --git a/src/viminfo.c b/src/viminfo.c
index ac0d385..3620b58 100644
--- a/src/viminfo.c
+++ b/src/viminfo.c
@@ -2912,7 +2912,7 @@
 	return;
     vir.vir_fd = fp_in;
     vir.vir_conv.vc_type = CONV_NONE;
-    ga_init2(&vir.vir_barlines, (int)sizeof(char_u *), 100);
+    ga_init2(&vir.vir_barlines, sizeof(char_u *), 100);
     vir.vir_version = -1;
 
     if (fp_in != NULL)