tweaks: don't call strcmp() to determine whether a string is empty

src/files.c

@@ -435,7 +435,7 @@ bool open_buffer(const char *filename, bool undoable)
 
 	/* When the specified filename is not empty, and the corresponding
 	 * file exists, verify that it is a normal file. */
-	if (strcmp(filename, "") != 0) {
+	if (*filename != '\0') {
 		struct stat fileinfo;
 
 		if (stat(realname, &fileinfo) == 0 && !(S_ISREG(fileinfo.st_mode) ||

src/utils.c

@@ -48,7 +48,7 @@ void get_homedir(void)
 
 		/* Only set homedir if some home directory could be determined,
 		 * otherwise keep homedir NULL. */
-		if (homenv != NULL && strcmp(homenv, "") != 0)
+		if (homenv != NULL && *homenv != '\0')
 			homedir = mallocstrcpy(NULL, homenv);
 	}
 }