Resolve new GCC warnings:

comparison between signed and unsigned integer expressions

src/sbbs3/cmdshell.h

 /* cmdshell.h */
+// vi: tabstop=4
 
 /* Synchronet command shell/module constants and structure definitions */
 
@@ -670,7 +671,8 @@ typedef struct {					/* Command shell image */
 			cmdrets;				/* Command returns on stack */
 
 	int32_t	ftp_mode,				/* FTP operation mode */
-			*int_var,				/* Integer variables */
+			*int_var;				/* Integer variables */
+	uint32_t
 			*str_var_name,			/* String variable names (CRC-32) */
 			*int_var_name;			/* Integer variable names (CRC-32) */
 	long	retval, 				/* Return value */

src/sbbs3/execmisc.cpp

@@ -138,7 +138,7 @@ int sbbs_t::exec_misc(csi_t* csi, char *path)
 					csi->str_vars++;
 					csi->str_var=(char **)realloc(csi->str_var
 						,sizeof(char *)*csi->str_vars);
-					csi->str_var_name=(int32_t *)realloc(csi->str_var_name
+					csi->str_var_name=(uint32_t *)realloc(csi->str_var_name
 						,sizeof(int32_t)*csi->str_vars);
 					if(csi->str_var==NULL
 						|| csi->str_var_name==NULL) { /* REALLOC failed */
@@ -168,7 +168,7 @@ int sbbs_t::exec_misc(csi_t* csi, char *path)
 					csi->int_vars++;
 					csi->int_var=(int32_t *)realloc(csi->int_var
 						,sizeof(char *)*csi->int_vars);
-					csi->int_var_name=(int32_t *)realloc(csi->int_var_name
+					csi->int_var_name=(uint32_t *)realloc(csi->int_var_name
 						,sizeof(int32_t)*csi->int_vars);
 					if(csi->int_var==NULL
 						|| csi->int_var_name==NULL) { /* REALLOC failed */
@@ -198,7 +198,7 @@ int sbbs_t::exec_misc(csi_t* csi, char *path)
 					global_str_vars++;
 					global_str_var=(char **)realloc(global_str_var
 						,sizeof(char *)*global_str_vars);
-					global_str_var_name=(int32_t *)realloc(global_str_var_name
+					global_str_var_name=(uint32_t *)realloc(global_str_var_name
 						,sizeof(int32_t)*global_str_vars);
 					if(global_str_var==NULL
 						|| global_str_var_name==NULL) { /* REALLOC failed */
@@ -229,7 +229,7 @@ int sbbs_t::exec_misc(csi_t* csi, char *path)
 					global_int_vars++;
 					global_int_var=(int32_t *)realloc(global_int_var
 						,sizeof(char *)*global_int_vars);
-					global_int_var_name=(int32_t *)realloc(global_int_var_name
+					global_int_var_name=(uint32_t *)realloc(global_int_var_name
 						,sizeof(int32_t)*global_int_vars);
 					if(global_int_var==NULL
 						|| global_int_var_name==NULL) { /* REALLOC failed */

src/sbbs3/sbbs.h

@@ -541,10 +541,10 @@ public:
 			/* Global command shell variables */
 	uint	global_str_vars;
 	char **	global_str_var;
-	int32_t *	global_str_var_name;
+	uint32_t *	global_str_var_name;
 	uint	global_int_vars;
 	int32_t *	global_int_var;
-	int32_t *	global_int_var_name;
+	uint32_t *	global_int_var_name;
 	char *	sysvar_p[MAX_SYSVARS];
 	uint	sysvar_pi;
 	int32_t	sysvar_l[MAX_SYSVARS];