loader/efi: return error from efi_find_framebuffer

Also return actual errno values in other code paths.
(suggested by tsoome)

Reviewed by:	tsoome, imp
Differential Revision:	https://reviews.freebsd.org/D52432

1 files changed, 5 insertions, 2 deletions

diff --git a/stand/efi/loader/framebuffer.c b/stand/efi/loader/framebuffer.c
index 141a29305f7c..fc61ed15ba3c 100644
--- a/stand/efi/loader/framebuffer.c
+++ b/stand/efi/loader/framebuffer.c
@@ -630,7 +630,7 @@ efi_find_framebuffer(teken_gfx_t *gfx_state)
 			gfx_state->tg_fb_type = FB_UGA;
 			gfx_state->tg_private = uga;
 		} else {
-			return (1);
+			return (efi_status_to_errno(status));
 		}
 	}
 
@@ -644,9 +644,12 @@ efi_find_framebuffer(teken_gfx_t *gfx_state)
 		break;
 
 	default:
-		return (1);
+		return (EINVAL);
 	}
 
+	if (rv != 0)
+		return (rv);
+
 	gfx_state->tg_fb.fb_addr = efifb.fb_addr;
 	gfx_state->tg_fb.fb_size = efifb.fb_size;
 	gfx_state->tg_fb.fb_height = efifb.fb_height;