wcap: Add GCC_CFLAGS and fix more compiler warnings

wcap/Makefile.am

@@ -5,5 +5,5 @@ wcap_decode_SOURCES =				\
 	wcap-decode.c				\
 	wcap-decode.h
 
-wcap_decode_CFLAGS = $(WCAP_CFLAGS)
+wcap_decode_CFLAGS = $(GCC_CFLAGS) $(WCAP_CFLAGS)
 wcap_decode_LDADD = $(WCAP_LIBS)

wcap/main.c

@@ -30,6 +30,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <fcntl.h>
+#include <assert.h>
 
 #include <cairo.h>
 
@@ -65,6 +66,8 @@ rgb_to_yuv(uint32_t format, uint32_t p, int *u, int *v)
 		g = (p >> 8) & 0xff;
 		b = (p >> 16) & 0xff;
 		break;
+	default:
+		assert(0);
 	}
 
 	y = (19595 * r + 38469 * g + 7472 * b) >> 16;

wcap/wcap-decode.c

@@ -85,9 +85,7 @@ wcap_decoder_get_frame(struct wcap_decoder *decoder)
 {
 	struct wcap_rectangle *rects;
 	struct wcap_frame_header *header;
-	uint32_t *s;
 	uint32_t i;
-	int width, height;
 
 	if (decoder->p == decoder->end)
 		return 0;
@@ -98,11 +96,8 @@ wcap_decoder_get_frame(struct wcap_decoder *decoder)
 
 	rects = (void *) (header + 1);
 	decoder->p = (uint32_t *) (rects + header->nrects);
-	for (i = 0; i < header->nrects; i++) {
-		width = rects[i].x2 - rects[i].x1;
-		height = rects[i].y2 - rects[i].y1;
+	for (i = 0; i < header->nrects; i++)
 		wcap_decoder_decode_rectangle(decoder, &rects[i]);
-	}
 
 	return 1;
 }