[patch] fixed compilation warning in version.c with gcc-4.7

[Dominique Pellé]

Hi

Compiling vim-7.3.462 with gcc-4.7.0 20120213 (experimental),
gives the following compilation warning:

version.c:2189:14: warning: array subscript is above array bounds
[-Warray-bounds]

Warning looks scary but in this case it is harmless.
Attached patch changes the code to avoid the warning.

Regards
-- Dominique

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diff -r f1f6ac67acd8 src/version.c
--- a/src/version.c	Wed Feb 29 19:20:03 2012 +0100
+++ b/src/version.c	Sat Mar 03 22:08:57 2012 +0100
@@ -2161,6 +2161,7 @@
     int		col;
     char_u	*p;
     int		l;
+    int		len;
     int		clen;
 #ifdef MODIFIED_BY
 # define MODBY_LEN 150
@@ -2185,12 +2186,9 @@
 	    /* Check for 9.9x or 9.9xx, alpha/beta version */
 	    if (isalpha((int)vers[3]))
 	    {
-		if (isalpha((int)vers[4]))
-		    sprintf((char *)vers + 5, ".%d%s", highest_patch(),
-							   mediumVersion + 5);
-		else
-		    sprintf((char *)vers + 4, ".%d%s", highest_patch(),
-							   mediumVersion + 4);
+		len = (isalpha((int)vers[4])) ? 5 : 4;
+		sprintf((char *)vers + len, ".%d%s", highest_patch(),
+							mediumVersion + len);
 	    }
 	    else
 		sprintf((char *)vers + 3, ".%d", highest_patch());