rename nerrors to errstacksize in liberror
the other name was too popular and was used by other programs here.

Reference: /n/patches.lsub.org/patch/liberror
Date: Thu Apr 19 12:58:47 CES 2012
Signed-off-by: nemo@lsub.org

--- /sys/src/liberror/error.c	Thu Apr 12 12:26:20 2012
+++ /sys/src/liberror/error.c	Wed Apr 11 16:20:52 2012
@@ -19,7 +19,7 @@
 }
 
 int
-nerrors(void)
+errstacksize(void)
 {
 	return (*__ep)->nerr;
 }
--- /sys/include/error.h	Thu Apr 12 12:24:41 2012
+++ /sys/include/error.h	Wed Apr 11 16:20:49 2012
@@ -10,11 +10,10 @@
 };
 
 #pragma	varargck	argpos	error	1
-#pragma varargck		argpos	esmprint 1
 
 void	errinit(int stack);
 void	noerror(void);
-int	nerrors(void);
+int	errstacksize(void);
 void	error(char* msg, ...);
 #define	catcherror()	setjmp((*__ep)->label[(*__ep)->nerr++])
 extern Error**	__ep;
--- /sys/man/2/error	Thu Apr 12 12:24:57 2012
+++ /sys/man/2/error	Wed Apr 11 16:22:04 2012
@@ -21,7 +21,7 @@
 void	catcherror(void)
 .br
 .B
-int	nerrors(void)
+int	errstacksize(void)
 .SH DESCRIPTION
 These routiles are tools for error handling.
 .IR catcherror ,
@@ -50,7 +50,7 @@
 .I Error
 raises an error. If the argument is nil, the error string is unaltered. See the example.
 .PP
-.I Nerrors
+.I Errstacksize
 returns the number of recovery points kept in the error stack. Useful to
 perform debug checks to see if the stack depth is what it should be.
 .SH SOURCE