fix copy+paste mistakes in commit 9b0e5c555c0f (CVE-2019-7637 fix):

sezero · sezero · commit 267d102f6e9c · 2019-08-02T00:35:05.000+03:00
http://hg.libsdl.org/SDL/rev/9b0e5c555c0f made copy+paste mistakes which resulted in windows versions failing to set video mode.
diff --git a/src/video/gapi/SDL_gapivideo.c b/src/video/gapi/SDL_gapivideo.c
@@ -733,7 +733,7 @@ SDL_Surface *GAPI_SetVideoMode(_THIS, SDL_Surface *current,
 	video->w = gapi->w = width;
 	video->h = gapi->h = height;
 	video->pitch = SDL_CalculatePitch(video); 
-	if (!current->pitch) {
+	if (!video->pitch) {
 		return(NULL);
 	}
 
diff --git a/src/video/windib/SDL_dibvideo.c b/src/video/windib/SDL_dibvideo.c
@@ -675,7 +675,7 @@ SDL_Surface *DIB_SetVideoMode(_THIS, SDL_Surface *current,
 	video->w = width;
 	video->h = height;
 	video->pitch = SDL_CalculatePitch(video);
-	if (!current->pitch) {
+	if (!video->pitch) {
 		return(NULL);
 	}
 
diff --git a/src/video/windx5/SDL_dx5video.c b/src/video/windx5/SDL_dx5video.c
@@ -1127,7 +1127,7 @@ SDL_Surface *DX5_SetVideoMode(_THIS, SDL_Surface *current,
 		video->w = width;
 		video->h = height;
 		video->pitch = SDL_CalculatePitch(video);
-		if (!current->pitch) {
+		if (!video->pitch) {
 			return(NULL);
 		}
 

Original file line number	Diff line number	Diff line change
`@@ -733,7 +733,7 @@ SDL_Surface GAPI_SetVideoMode(_THIS, SDL_Surface current,`
`733`	`733`	`video->w = gapi->w = width;`
`734`	`734`	`video->h = gapi->h = height;`
`735`	`735`	`video->pitch = SDL_CalculatePitch(video);`
`736`		`- if (!current->pitch) {`
	`736`	`+ if (!video->pitch) {`
`737`	`737`	`return(NULL);`
`738`	`738`	`}`
`739`	`739`
Original file line number	Diff line number	Diff line change
`@@ -675,7 +675,7 @@ SDL_Surface DIB_SetVideoMode(_THIS, SDL_Surface current,`
`675`	`675`	`video->w = width;`
`676`	`676`	`video->h = height;`
`677`	`677`	`video->pitch = SDL_CalculatePitch(video);`
`678`		`- if (!current->pitch) {`
	`678`	`+ if (!video->pitch) {`
`679`	`679`	`return(NULL);`
`680`	`680`	`}`
`681`	`681`
Original file line number	Diff line number	Diff line change
`@@ -1127,7 +1127,7 @@ SDL_Surface DX5_SetVideoMode(_THIS, SDL_Surface current,`
`1127`	`1127`	`video->w = width;`
`1128`	`1128`	`video->h = height;`
`1129`	`1129`	`video->pitch = SDL_CalculatePitch(video);`
`1130`		`- if (!current->pitch) {`
	`1130`	`+ if (!video->pitch) {`
`1131`	`1131`	`return(NULL);`
`1132`	`1132`	`}`
`1133`	`1133`