freedreno: Fix file descriptor leak.

Fix defects reported by Coverity Scan.

Resource leak (RESOURCE_LEAK)
leaked_handle: Handle variable fd going out of scope leaks the handle.

Argument cannot be negative (NEGATIVE_RETURNS)
negative_returns: fd is passed to a parameter that cannot be negative.

Fixes: 1ea4ef0d3b ("freedreno: slurp in decode tools")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6642>

src/freedreno/decode/pgmdump.c

@@ -405,7 +405,10 @@ static void dump_raw_shader(uint32_t *dwords, uint32_t sizedwords, int n, char *
 
 	sprintf(filename, "%.*s-%d.%s", (int)strlen(infile)-3, infile, n, ext);
 	fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, 0644);
-	write(fd, dwords, sizedwords * 4);
+	if (fd != -1) {
+		write(fd, dwords, sizedwords * 4);
+		close(fd);
+	}
 }
 
 static void dump_shaders_a2xx(struct state *state)