The buffer returned by fgenln is not a "C" string and might not be NUL

terminated. Make sure that it is before using it.

Reviewed by:	marck@
MFC after:	3 days

gnu/usr.bin/patch/common.h

@@ -34,6 +34,7 @@
 #define Strcpy (void)strcpy
 #define Strcat (void)strcat
 #define Strlcpy (void)strlcpy
+#define Strncpy (void)strncpy
 #define Strlcat (void)strlcat
 
 /* NeXT declares malloc and realloc incompatibly from us in some of

gnu/usr.bin/patch/pch.c

@@ -1176,7 +1176,8 @@ pgets(bool do_indent)
 					indent++;
 			}
 		}
-		Strlcpy(buf, line, len + 1 - skipped);
+		Strncpy(buf, line, len - skipped);
+		buf[len - skipped] = '\0';
 	}
 	return len;
 }