Warning fixes

Author: LibretroAdmin

gfx/drivers/metal.m

@@ -4300,7 +4300,7 @@ - (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce
 
 - (void)drawWithContext:(Context *)ctx
 {
-   int i;
+   size_t i;
    _texture = _engine.frame.texture[0].view;
 
    if (     (_format != RPixelFormatBGRA8Unorm)
@@ -4938,7 +4938,7 @@ - (bool)loadImages:(const struct texture_image *)images count:(NSUInteger)count
 
 - (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce
 {
-   int i;
+   size_t i;
    NSUInteger count;
 #if !defined(HAVE_COCOATOUCH)
    if (_vertDirty)

ui/drivers/ui_cocoa.m

@@ -681,7 +681,7 @@ - (void)dealloc
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
 {
-   unsigned i;
+   int i;
    apple_platform   = self;
    [self.window setAcceptsMouseMovedEvents: YES];