Fix leak detection

zig/sdl/hello_sdl.zig

@@ -18,6 +18,9 @@ const std = @import("std");
pub fn main() !void {
    var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){};
    defer {
        _ = general_purpose_allocator.detectLeaks();
    }
    const gpa = &general_purpose_allocator.allocator;
    const args = try std.process.argsAlloc(gpa);
    defer std.process.argsFree(gpa, args);
@@ -65,6 +68,7 @@ pub fn main() !void {
    var max_chars = std.math.min(@divTrunc(@intCast(usize, window_width), @intCast(usize, glyph_width)), msg.len);
    var result: []const u8 = try gpa.alloc(u8, 0);
    defer gpa.free(result);
    const keyboardState = c.SDL_GetKeyboardState(null);
@@ -218,8 +222,6 @@ pub fn main() !void {
        c.SDL_Delay(16);
    }
    _ = general_purpose_allocator.detectLeaks();
}
fn runCommand(raw_cmd: []const u8, allocator: *std.mem.Allocator) ![]const u8 {