use foo(void) instead of foo() in prototypes

In C, the latter isn't a prototype for a function with no arg,
but declares a function with an undefined number of args.

gdi_canvas.c

@@ -1828,7 +1828,7 @@ SpiceCanvas *gdi_canvas_create(int width, int height,
     return (SpiceCanvas *)canvas;
 }
 
-void gdi_canvas_init() //unsafe global function
+void gdi_canvas_init(void) //unsafe global function
 {
     if (!need_init) {
         return;

gdi_canvas.h

@@ -38,7 +38,7 @@ SpiceCanvas *gdi_canvas_create(int width, int height,
                                SpiceJpegDecoder *jpeg_decoder,
                                SpiceZlibDecoder *zlib_decoder);
 
-void gdi_canvas_init();
+void gdi_canvas_init(void);
 
 #ifdef __cplusplus
 }

gl_canvas.c

@@ -870,7 +870,7 @@ static void gl_canvas_destroy(SpiceCanvas *spice_canvas)
     free(canvas);
 }
 
-void gl_canvas_init() //unsafe global function
+void gl_canvas_init(void) //unsafe global function
 {
     if (!need_init) {
         return;

gl_canvas.h

@@ -40,7 +40,7 @@ SpiceCanvas *gl_canvas_create(int width, int height, uint32_t format
                            , SpiceZlibDecoder *zlib_decoder
                            );
 void gl_canvas_set_textures_lost(SpiceCanvas *canvas, int textures_lost);
-void gl_canvas_init();
+void gl_canvas_init(void);
 
 #ifdef __cplusplus
 }

quic.c

@@ -1690,7 +1690,7 @@ void quic_destroy(QuicContext *quic)
     encoder->usr->free(encoder->usr, encoder);
 }
 
-void quic_init()
+void quic_init(void)
 {
     if (!need_init) {
         return;

quic.h

@@ -63,7 +63,7 @@ int quic_decode(QuicContext *quic, QuicImageType type, uint8_t *buf, int stride)
 QuicContext *quic_create(QuicUsrContext *usr);
 void quic_destroy(QuicContext *quic);
 
-void quic_init();
+void quic_init(void);
 
 #ifdef __cplusplus
 }

rop3.c

@@ -381,7 +381,7 @@ ROP3_HANDLERS(DPSoo, *src | *pat | *dest, 0xfe);
     rop3_test_handlers_32[index] = rop3_test32_##op;             \
     rop3_test_handlers_16[index] = rop3_test16_##op;
 
-void rop3_init()
+void rop3_init(void)
 {
     static int need_init = 1;
     int i;

rop3.h

@@ -33,7 +33,7 @@ void do_rop3_with_pattern(uint8_t rop3, pixman_image_t *d, pixman_image_t *s, Sp
 void do_rop3_with_color(uint8_t rop3, pixman_image_t *d, pixman_image_t *s, SpicePoint *src_pos,
                         uint32_t rgb);
 
-void rop3_init();
+void rop3_init(void);
 
 #ifdef __cplusplus
 }

spice_common.h

@@ -60,7 +60,7 @@
     }                                                               \
 }
 
-static inline uint64_t get_time_stamp()
+static inline uint64_t get_time_stamp(void)
 {
     struct timespec time_space;
     clock_gettime(CLOCK_MONOTONIC, &time_space);

sw_canvas.c

@@ -1276,7 +1276,7 @@ SpiceCanvas *canvas_create_for_data(int width, int height, uint32_t format,
                                 );
 }
 
-void sw_canvas_init() //unsafe global function
+void sw_canvas_init(void) //unsafe global function
 {
     if (!need_init) {
         return;

sw_canvas.h

@@ -57,7 +57,7 @@ SpiceCanvas *canvas_create_for_data(int width, int height, uint32_t format, uint
                            );
 
 
-void sw_canvas_init();
+void sw_canvas_init(void);
 
 #ifdef __cplusplus
 }