spirv: fix typo in warning message

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

src/compiler/spirv/spirv_to_nir.c

@@ -558,7 +558,7 @@ struct_member_decoration_cb(struct vtn_builder *b,
    case SpvDecorationFPRoundingMode:
    case SpvDecorationFPFastMathMode:
    case SpvDecorationAlignment:
-      vtn_warn("Decoraiton only allowed for CL-style kernels: %s",
+      vtn_warn("Decoration only allowed for CL-style kernels: %s",
                spirv_decoration_to_string(dec->decoration));
       break;
    }