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ps: ignore trailing spaces when checking EPS file header

--- a/ps.c

+++ b/ps.c

@@ -266,10 +266,15 @@

 	int nbb;

 	if (!(filp = fopen(eps, "r")))

 		return;

-	if (!fgets(buf, sizeof(buf), filp) ||

-			(strcmp(buf, "%!PS-Adobe-2.0 EPSF-1.2\n") &&

-			strcmp(buf, "%!PS-Adobe-2.0 EPSF-2.0\n") &&

-			strcmp(buf, "%!PS-Adobe-3.0 EPSF-3.0\n"))) {

+	if (!fgets(buf, sizeof(buf), filp)) {

+		fprintf(stderr, "warning: file %s is empty\n", eps);

+		fclose(filp);

+		return;

+	}

+	if (strncmp(buf, "%!PS-Adobe-2.0 EPSF-1.2", 23) &&

+			strncmp(buf, "%!PS-Adobe-2.0 EPSF-2.0", 23) &&

+			strncmp(buf, "%!PS-Adobe-3.0 EPSF-3.0", 23)) {

+		fprintf(stderr, "warning: unsupported EPSF version in %s\n", eps);

 		fclose(filp);

 		return;

 	}