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/scriptfile.c b/src/scriptfile.c
index 8fb3cae..c10a82f 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -835,7 +835,7 @@
     *num_file = 0;
     *file = NULL;
     pat_len = (int)STRLEN(pat);
-    ga_init2(&ga, (int)sizeof(char *), 10);
+    ga_init2(&ga, sizeof(char *), 10);
 
     for (i = 0; dirnames[i] != NULL; ++i)
     {
@@ -929,7 +929,7 @@
     *num_file = 0;
     *file = NULL;
     pat_len = (int)STRLEN(pat);
-    ga_init2(&ga, (int)sizeof(char *), 10);
+    ga_init2(&ga, sizeof(char *), 10);
 
     s = alloc(pat_len + 26);
     if (s == NULL)
@@ -1833,7 +1833,7 @@
 	{
 	    garray_T    ga;
 
-	    ga_init2(&ga, (int)sizeof(char_u), 400);
+	    ga_init2(&ga, sizeof(char_u), 400);
 	    ga_concat(&ga, line);
 	    if (*p == '\\')
 		ga_concat(&ga, p + 1);