main/astfd: Fix GCC8 format-truncation warning.

The field used to store call arguments was not large enough to hold the
arguments string that can be constructed for 'open'.  Expand it to
prevent this warning/error.

Change-Id: I514927f256481bc84df10a51b19d5b5fb1bc387e

main/astfd.c

@@ -53,7 +53,7 @@ static struct fdleaks {
 	unsigned int isopen:1;
 	char file[40];
 	char function[25];
-	char callargs[60];
+	char callargs[100];
 } fdleaks[1024] = { { "", }, };
 
 /* COPY does ast_copy_string(dst, src, sizeof(dst)), except: